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Ishida H, Naganuma H. Letter to the Editor on "Can Modifications of LR-M Criteria Improve the Diagnostic Performance of Contrast-Enhanced Ultrasound LI-RADS for Small Hepatic Lesions up to 3 cm?". J Ultrasound Med 2024; 43:821-823. [PMID: 38164887 DOI: 10.1002/jum.16407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Accepted: 12/18/2023] [Indexed: 01/03/2024]
Affiliation(s)
- Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Akita, Japan
| | - Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Akita, Japan
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2
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Ishida H, Naganuma H. Letter to the Editor on "Two-Dimensional Shear Wave Elastography: Utility in Differentiating Gallbladder Cancer From Chronic Cholecystitis". J Ultrasound Med 2024; 43:415-416. [PMID: 37842842 DOI: 10.1002/jum.16362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Accepted: 10/01/2023] [Indexed: 10/17/2023]
Affiliation(s)
- Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Akita, Japan
| | - Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Akita, Japan
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Ishida H, Naganuma H. Letter to the Editor on "Strategy for Accurate Diagnosis by Contrast-Enhanced Ultrasound of Focal Liver Lesions in Patients Not at High Risk for Hepatocellular Carcinoma". J Ultrasound Med 2023; 42:2913-2914. [PMID: 37638774 DOI: 10.1002/jum.16325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 08/13/2023] [Indexed: 08/29/2023]
Affiliation(s)
- Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Akita, Japan
| | - Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote City, Japan
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Naganuma H, Ishida H. Hepatocellular Carcinoma in Non-Fibrotic Liver: A Narrative Review. Diagnostics (Basel) 2023; 13:3426. [PMID: 37998562 PMCID: PMC10670297 DOI: 10.3390/diagnostics13223426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 11/08/2023] [Accepted: 11/09/2023] [Indexed: 11/25/2023] Open
Abstract
Hepatocellular carcinoma (HCC) in a non-fibrotic liver (F0) is considered to be rare, and there is a marked paucity of studies in the literature on this HCC type. A review of the literature shows some important clinical and tumor characteristics: (a) it occurs mainly in young female and elder male patients; (b) clinically, under normal hepatic function, alpha-fetoprotein level is often normal, and there are no risk factors; (c) associated with metabolic disease; (d) macroscopically, single large lesions are noted; and (e) microscopically, the lesions are well-differentiated and encapsulated. Radiological imaging results are straightforward, showing arterial hyperenhancement and later wash-out. The combined use of B-mode and contrast-enhanced (CE) ultrasound (US) is the most reliable and cost-effective diagnostic method. Few peri-and post-operative complications are noted and 5-year survival is not inferior to patients with HCC on fibrosis liver despite the lesion's large size. Most clinicians believe that HCC is unlikely to occur if patients have no symptoms and normal hepatic function. Although detailed clinical data are very limited, we expect that this review will help to improve the clinical management of HCC in non-fibrotic livers.
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Affiliation(s)
- Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Negishi-cho 5-31, Yokote City 013-8602, Japan
| | - Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Kamikitate Saruta aza Naeshirosawa 222-1, Akita City 010-1495, Japan
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Ishida H, Naganuma H. Letter to the Editor on "Shear Wave Elastography in the Diagnosis of Tumor Extent of Basal Cell Carcinomas". J Ultrasound Med 2023; 42:2685-2686. [PMID: 37417832 DOI: 10.1002/jum.16304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 06/25/2023] [Indexed: 07/08/2023]
Affiliation(s)
- Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Akita, Japan
| | - Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote, Japan
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6
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Ishida H, Naganuma H. Letter to the Editor on "Vertical Artifacts as Lung Ultrasound Signs". J Ultrasound Med 2023; 42:2451-2452. [PMID: 37255056 DOI: 10.1002/jum.16281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 05/15/2023] [Indexed: 06/01/2023]
Affiliation(s)
- Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Akita, Japan
| | - Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Akita, Japan
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Ishida H, Naganuma H. Letter to the Editor on "Usefulness of Intestinal Ultrasound to Detect Small Intestinal Stenosis in Patients With Crohn's Disease". J Ultrasound Med 2023; 42:2175. [PMID: 37087756 DOI: 10.1002/jum.16239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 04/06/2023] [Indexed: 05/03/2023]
Affiliation(s)
- Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Akita, Japan
| | - Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote City, Japan
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8
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Ishida H, Naganuma H. Letter to the Editor on "Portal Vein Gas in Neonates Predicting Clinical Treatment Outcomes From Ultrasound Findings". J Ultrasound Med 2023; 42:1625. [PMID: 36594646 DOI: 10.1002/jum.16162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 12/08/2022] [Indexed: 06/17/2023]
Affiliation(s)
- Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Akita, Japan
| | - Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Akita, Japan
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Naganuma H, Ishida H. Factors other than fibrosis that increase measured shear wave velocity. World J Gastroenterol 2022; 28:6512-6521. [PMID: 36569278 PMCID: PMC9782834 DOI: 10.3748/wjg.v28.i46.6512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/27/2022] [Accepted: 11/21/2022] [Indexed: 12/08/2022] Open
Abstract
Shear wave elastography (SWE) is now becoming an indispensable diagnostic tool in the routine examination of liver diseases. In particular, accuracy is required for shear wave propagation velocity measurement, which is directly related to diagnostic accuracy. It is generally accepted that the liver shear wave propagation velocity reflects the degree of fibrosis, but there are still few reports on other factors that increase the shear wave propagation velocity. In this study, we reviewed such factors in the literature and examined their mechanisms. Current SWE measures propagation velocity based on the assumption that the medium has a homogeneous structure, uniform density, and is purely elastic. Otherwise, the measurement is subject to error. The other (confounding) factors that we routinely experience are primarily: (1) Conditions that appear to increase the viscous component; and (2) Conditions that appear to increase tissue density. Clinically, the former includes acute hepatitis, congested liver, biliary obstruction, etc, and the latter includes diffuse infiltration of malignant cells, various storage diseases, tissue necrosis, etc. In any case, it is important to evaluate SWE in the context of the entire clinical picture.
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Affiliation(s)
- Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote 013-8602, Japan
| | - Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Akita 010-1495, Japan
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Ishida H, Naganuma H. New horizon of contrast-enhanced sonography in the differential diagnosis of periampullary mass: A random forest nomogram. J Clin Ultrasound 2022; 50:929-930. [PMID: 36069464 DOI: 10.1002/jcu.23259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 06/03/2022] [Accepted: 06/06/2022] [Indexed: 06/15/2023]
Affiliation(s)
- Hideaki Ishida
- Center of Diagnostic Ultrasound, Akita Red Cross Hospital, Akita city, Japan
| | - Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote, Japan
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11
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Kon M, Ishida H, Yamanaka Y, Miyauchi T, Naganuma H. Isolated portal vein thrombus due to contraceptive low-dose estrogen progestin use. J Med Ultrason (2001) 2022; 49:495-496. [PMID: 35705777 DOI: 10.1007/s10396-022-01228-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 05/09/2022] [Indexed: 11/28/2022]
Affiliation(s)
- Motoko Kon
- Department of Internal Medicine, Oomori Municipal Hospital, 245-205 Oomirimachisugouta, Yokote City, Akita, 013-0525, Japan.
| | - Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Akita City, Akita, Japan
| | - Yumiko Yamanaka
- Department of Gastroenterology, Akita Red Cross Hospital, Akita City, Akita, Japan
| | - Takaharu Miyauchi
- Department of Radiology, Akita Red Cross Hospital, Akita City, Akita, Japan
| | - Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote City, Akita, Japan
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12
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Naganuma H, Ishida H. One-day seminar for residents for implementing abdominal pocket-sized ultrasound. World J Methodol 2021; 11:208-221. [PMID: 34322370 PMCID: PMC8299907 DOI: 10.5662/wjm.v11.i4.208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 04/10/2021] [Accepted: 06/01/2021] [Indexed: 02/06/2023] Open
Abstract
Despite its proven high utility, integration of pocked-sized portable ultrasound (US) into internal medicine residency training remains inconsistent. For 10 years, we have held a 1-d seminar biannually, consisting of lecture (half-day) and hands-on training (half-day) on pocket-sized US of the abdomen and lungs. The lecture consists of training on US physics and clinical applications of pocket-sized US, followed by a lecture covering the basic anatomy of the abdomen and lungs and introducing the systemic scanning method. Given the simple structure of pocket-sized US devices, understanding the basic physics is sufficient yet necessary to operate the pocket-sized US device. It is important to understand the selection of probes, adjustment of B mode gain, adjustment of color gain, and acoustic impedance. Basic comprehension may have a significant positive impact on the overall utilization of pocket-sized US devices. The easiest and most reliable way to observe the whole abdomen and lungs is a combination of transverse, sagittal, and oblique scanning, pursuing the main vascular system from the center to the periphery of the organ in the abdomen and systemic scanning of the pleura. There is usually a marked change in knowledge and attitudes among the program participants, although skill gaps remain among them. We discuss the limitations and problems to this education system as well.
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Affiliation(s)
- Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote 0138602, Akita, Japan
| | - Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Akita-City 010-1495, Japan
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Naganuma H, Ishida H, Uno A, Nagai H, Kuroda H, Ogawa M. Diagnostic problems in two-dimensional shear wave elastography of the liver. World J Radiol 2020; 12:76-86. [PMID: 32549956 PMCID: PMC7288776 DOI: 10.4329/wjr.v12.i5.76] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 05/06/2020] [Accepted: 05/13/2020] [Indexed: 02/06/2023] Open
Abstract
Two-dimensional shear wave elastography (2D-SWE) is used in the clinical setting for observation of the liver. Unfortunately, a wide spectrum of artifactual images are frequently encountered in 2D-SWE, the precise mechanisms of which remain incompletely understood. This review was designed to present many of the artifactual images seen in 2D-SWE of the liver and to analyze them by computer simulation models that support clinical observations. Our computer simulations yielded the following suggestions: (1) When performing 2D-SWE in patients with chronic hepatic disease, especially liver cirrhosis, it is recommended to measure shear wave values through the least irregular hepatic surface; (2) The most useful 2D-SWE in patients with focal lesion will detect lesions that are poorly visible on B-mode ultrasound and will differentiate true tumors from pseudo-tumors (e.g., irregular fatty change); and (3) Measurement of shear wave values in the area posterior to a focal lesion must be avoided.
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Affiliation(s)
- Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote 0138602, Akita, Japan
| | - Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Kamikitatesaruta 0101495, Akita, Japan
| | - Atsushi Uno
- Department of Gastroenterology, Oomori Municipal Hospital, Yokote 0130525, Akita, Japan
| | - Hiroshi Nagai
- New Generation Imaging Laboratory, Tokyo 1680065, Japan
| | - Hidekatsu Kuroda
- Division of Gastroenterology and Hepatology, Iwate Medical University, Morioka 0200023, Iwate, Japan
| | - Masahiro Ogawa
- Department of Gastroenterology and Hepatology, Nihon University Hospital, Chiyoda 1018309, Tokyo, Japan
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Naganuma H, Ishida H, Kuroda H, Suzuki Y, Ogawa M. Hereditary hemorrhagic telangiectasia: how to efficiently detect hepatic abnormalities using ultrasonography. J Med Ultrason (2001) 2020; 47:421-433. [PMID: 32390074 DOI: 10.1007/s10396-020-01022-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 03/30/2020] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Hereditary hemorrhagic telangiectasia (HHT) is a multiorgan genetic angiodysplastic affection characterized by visceral vascular malformations. It affects mainly the brains, lungs, gastrointestinal tract, and nasal mucosa. Unlike those organs, hepatic involvement, although very frequently occurring, is insufficiently recognized, mainly because of the complex vascular structure of this organ. Thus, treating HHT patients requires a solid understanding of these hepatic anomalies. It is especially important for any general clinicians to be able to recognize clinical findings in HHT, which leads to a high suspicion of HHT and have an index of suspicion for liver abnormalities of HHT. For this purpose, keen awareness of clinical as well as hepatic sonographic (US) findings is paramount. AIM The aim of this review is to summarize previously reported findings on the hepatic US through a thorough analysis of related articles, and to (a) determine the role of US in the diagnosis of hepatic involvement in HHT patients and (b) propose the most simple and easy way to detect HHT-related abnormalities during routine US examinations. CONCLUSION Hepatic US serves to diagnose the detailed complex hepatic changes typical of HHT, and contributes to increased diagnostic confidence of hepatic changes in HHT patients, with the most simple way not to overlook HHT-related abnormalities being to find hepatic artery dilatation.
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Affiliation(s)
- Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, 5-31 Negishi-cho, Yokote, Akita, 013-8602, Japan.
| | - Hideaki Ishida
- Center of Diagnostic Ultrasound, Akita Red Cross Hospital, Akita, Japan
| | - Hidekatsu Kuroda
- Division of Hepatology, Department of Internal Medicine, Iwate Medical University, Iwate, Japan
| | - Yasuaki Suzuki
- Department of Gastroenterology, Nayoro City General Hospital, Hokkaido, Japan
| | - Masahiro Ogawa
- Department of Gastroenterology and Hepatology, Nihon University Hospital, Tokyo, Japan
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Naganuma H, Ishida H, Ogawa M, Sato T, Sageshima M, Suzuki K, Ohyama Y. Cover Information. J Clin Ultrasound 2019; 47:i-i. [DOI: 10.1002/jcu.22751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
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Naganuma H, Ishida H, Ogawa M, Sato T, Sageshima M, Suzuki K, Ohyama Y. Hepatocellular carcinoma in otherwise sonographically normal liver. J Clin Ultrasound 2019; 47:325-330. [PMID: 30484875 DOI: 10.1002/jcu.22677] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 09/22/2018] [Accepted: 11/08/2018] [Indexed: 06/09/2023]
Abstract
PURPOSE Hepatocellular carcinoma (HCC) on normal liver is very rare. The goal of this study was to determine the clinical manifestations and the role of ultrasonography (US) in the diagnosis of HCC arising in normal liver. METHODS The clinical data and US findings in 12 cases of surgically resected HCC in normal liver were retrospectively analyzed. RESULTS The patients were asymptomatic, had no hepatocarcinogenic factor, and hepatic function tests were almost normal in most cases. HCCs were large, encapsulated, and solitary, and there were predominantly well-differentiated or moderately differentiated in most cases. US showed a hypoechoic rim and lateral shadowing, suggestive of peritumoral capsule formation, and on contrast-enhanced US (CEUS), the tumor was hyperenhanced in arterial phase and washed out in postvascular phase, revealing typical HCC findings. CONCLUSIONS US raises suspicion of HCC by showing lateral shadowing on grayscale ultrasound and hypervascularity on CEUS of the lesion.
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Affiliation(s)
- Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote, Akita Prefecture, Japan
| | - Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Akita, Akita Prefecture, Japan
| | - Masahiro Ogawa
- Department of Gastroenterology and Hepatology, Nihon University, Chiyoda, Tokyo, Japan
| | - Tutomu Sato
- Department of Surgery, Akita Municipal Hospital, Akita Prefecture, Japan
| | - Masato Sageshima
- Department of Pathology, Akita Municipal Hospital, Akita Prefecture, Japan
| | - Katunori Suzuki
- Department of Gastroenterology, Yamagata Prefectural Central Hospital, Yamagata, Yamagata Prefecture, Japan
| | - Yoko Ohyama
- Department of Clinical Laboratory, Akita Kousei Medical Hospital, Akita, Akita Prefecture, Japan
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Naganuma H, Ishida H, Nagai H, Ogawa M, Ohyama Y. Range-ambiguity artifact in abdominal ultrasound. J Med Ultrason (2001) 2019; 46:317-324. [PMID: 30888535 DOI: 10.1007/s10396-019-00938-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 02/19/2019] [Indexed: 12/17/2022]
Abstract
Range-ambiguity artifacts (RAAs) are an erroneous mapping of returning echoes into a composite picture. The purpose of this review was to illustrate the mechanism of RAAs and to present the diagnostic problems caused by RAAs. RAA features differ slightly from organ to organ. At the level of the urinary bladder, RAAs take the form of a cloud-like, ill-demarcated, immobile, echogenic area, and the depth of the echogenic area differs depending on the pulse repetition frequency (PRF). This form is referred to as "static RAA" in this review. There are two key ultrasound characteristics of RAAs at the level of the liver: (a) the depth of RAAs change according to the PRF, and (b) RAAs move in accordance with the cardiac cycle. This form is referred to as "mobile RAA" in this review. At the level of the gallbladder, RAAs take the form of fine echogenic lines in the gallbladder. This phenomenon is actually a combination of two phenomena: a ring-down artifact and RAA. This form is referred to as "complex RAA (searchlight phenomenon)" in this review. The easiest way to reduce RAAs is to change the image depth. Sufficient knowledge of RAAs can prevent misdiagnosis of erroneously displayed returning echoes as real pathologic changes.
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Affiliation(s)
- Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, 5-31 Negishi-cho, Yokote, Akita, 013-8602, Japan.
| | - Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Akita, Japan
| | | | - Masahiro Ogawa
- Department of Gastroenterology and Hepatology, Nihon University, Tokyo, Japan
| | - Yoko Ohyama
- Department of Clinical Laboratory, Akita Kousei Medical Hospital, Akita, Japan
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Naganuma H, Ishida H, Yoshida M, Funaoka M, Ito S, Ohyama Y. Multinodular fatty change in the liver in three patients with chronic hepatic porphyria: Contribution of sonography to the diagnosis. J Clin Ultrasound 2019; 47:165-168. [PMID: 30378127 DOI: 10.1002/jcu.22660] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Revised: 09/26/2018] [Accepted: 10/05/2018] [Indexed: 06/08/2023]
Abstract
We present three cases of chronic hepatic porphyria (CHP) in alcoholic patients, in which grayscale ultrasound (US) revealed multiple echogenic masses in the liver, mimicking multinodular hepatocellular carcinoma on alcoholic liver injury. In all cases, contrast-enhanced US (CEUS) showed iso-enhancement of the mass lesions throughout all vascular phases. Additionally, two-dimensional shear wave elastography (2DSWE) (performed in two cases) revealed the mass to have almost the same SWE value as the surrounding parenchyma. When encountering alcoholic patients with multiple echogenic masses in the liver, CHP must be included in the differential diagnosis. CEUS and 2DSWE allow us to increase our diagnostic confidence of CHP.
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Affiliation(s)
- Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote, Japan
| | - Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, Akita, Japan
| | - Makoto Yoshida
- Department of Cellular and Organ Pathology, Graduate School of Medicine, Akita University, Akita, Japan
| | - Masato Funaoka
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote, Japan
| | - Shuichi Ito
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote, Japan
| | - Yoko Ohyama
- Department of Clinical Laboratory, Akita Kousei Medical Hospital, Akita, Japan
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Yamanaka Y, Ishida H, Naganuma H, Komatsuda T, Miyazawa H, Miyauchi T, Takahashi S, Tozawa T, Enomoto K. Superb microvascular imaging (SMI) findings of splenic artery pseudoaneurysm: a report of two cases. J Med Ultrason (2001) 2018; 45:515-523. [PMID: 29383555 DOI: 10.1007/s10396-018-0858-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 12/11/2017] [Indexed: 01/25/2023]
Abstract
Splenic artery pseudoaneurysm (SAPA) is a relatively infrequently encountered but clinically important vascular change, because it carries a high risk of rupture that warrants prompt treatment regardless of its size. Thus, sufficient knowledge is indispensable when seeing chronic pancreatitis patients or post-traumatic patients. Here, we report two such cases. The first case was a 52-year-old woman known to have chronic pancreatitis who presented with hematemesis and hemodynamic instability in which X-ray computed tomography (CT) and color Doppler sonography (CDS) had difficulty visualizing slow blood flow in SAPA, but superb microvascular imaging (SMI) clearly demonstrated the slow blood flow in SAPA, prompting our therapeutic decision to perform rapid embolization. The second case was a 51-year-old woman with post-traumatic SAPA in which 3D SMI enabled us to understand more clearly the topographic relationship between multiple SAPAs as compared with conventional US, leading to a decision to provide immediate surgical treatment. SMI was thought to provide a new insight into the US diagnosis of SAPA. When examining patients suspected of having a SAPA, SMI is an indispensable diagnostic tool at present.
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Affiliation(s)
- Yumiko Yamanaka
- Center of Diagnostic Ultrasound, Akita Red Cross Hospital, 222-1 Kamikitade, Saruta, Nawashirosawa, Akita, 010-1495, Japan.
| | - Hideaki Ishida
- Center of Diagnostic Ultrasound, Akita Red Cross Hospital, 222-1 Kamikitade, Saruta, Nawashirosawa, Akita, 010-1495, Japan
| | - Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote, Japan
| | - Tomoya Komatsuda
- Center of Diagnostic Ultrasound, Akita Red Cross Hospital, 222-1 Kamikitade, Saruta, Nawashirosawa, Akita, 010-1495, Japan
| | - Hideaki Miyazawa
- Department of Gastrointestinal Surgery, Akita Red Cross Hospital, Akita, Japan
| | | | - Satoshi Takahashi
- Department of Diagnostic Radiology, Akita University Hospital, Akita, Japan
| | - Tomoki Tozawa
- Department of Diagnostic Radiology, Akita University Hospital, Akita, Japan
| | - Katsuhiko Enomoto
- Department of Diagnostic Pathology, Akita Red Cross Hospital, Akita, Japan
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Naganuma H, Ishida H, Komatsuda T, Hakamada M, Sawada T, Satoyoshi R, Enomoto K, Miyauchi T. Sonographic findings in two cases of lymphangioma of the mesocolon in adults. J Clin Ultrasound 2018; 46:78-81. [PMID: 28440897 DOI: 10.1002/jcu.22488] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Revised: 02/15/2017] [Accepted: 03/15/2017] [Indexed: 06/07/2023]
Abstract
Lymphangioma of the mesocolon is very rare. We report two cases of surgically resected and histologically proven mesocolic lymphangioma in adults. In both cases, ultrasound revealed a large cystic mass with multiple thin septa in the lower abdomen. A peculiar finding was the large craniocaudal sliding movement of the mass synchronized with the patient's respiration, which was a clue to the diagnosis of mesenteric lymphangioma. © 2017 Wiley Periodicals, Inc. J Clin Ultrasound 46:78-81, 2018.
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Affiliation(s)
- Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, 5-31 Negishi-cho, Yokote-shi, Akita, 013-8602, Japan
| | - Hideaki Ishida
- Department of Gastroenterology, Akita Red Cross Hospital, 222-1 Kamikitade Saruta, Akita-shi, Akita, 010-1495, Japan
| | - Tomoya Komatsuda
- Department of Gastroenterology, Akita Red Cross Hospital, 222-1 Kamikitade Saruta, Akita-shi, Akita, 010-1495, Japan
| | - Mayu Hakamada
- Department of Gastroenterology, Akita Red Cross Hospital, 222-1 Kamikitade Saruta, Akita-shi, Akita, 010-1495, Japan
| | - Toshiya Sawada
- Department of Surgery, Akita Red Cross Hospital, 222-1 Kamikitade Saruta, Akita-shi, Akita, 010-1495, Japan
| | - Rika Satoyoshi
- Department of Surgery, Akita Red Cross Hospital, 222-1 Kamikitade Saruta, Akita-shi, Akita, 010-1495, Japan
| | - Katsuhiko Enomoto
- Department of Pathology, Akita Red Cross Hospital, 222-1 Kamikitade Saruta, Akita-shiAkita, 010-1495, Japan
| | - Takaharu Miyauchi
- Department of Radiology, Akita Red Cross Hospital, 222-1 Kamikitade Saruta, Akita-shi, Akita, 010-1495, Japan
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21
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Lesne E, Fu Y, Oyarzun S, Rojas-Sánchez JC, Vaz DC, Naganuma H, Sicoli G, Attané JP, Jamet M, Jacquet E, George JM, Barthélémy A, Jaffrès H, Fert A, Bibes M, Vila L. Highly efficient and tunable spin-to-charge conversion through Rashba coupling at oxide interfaces. Nat Mater 2016; 15:1261-1266. [PMID: 27571452 DOI: 10.1038/nmat4726] [Citation(s) in RCA: 119] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 07/08/2016] [Indexed: 05/23/2023]
Abstract
The spin-orbit interaction couples the electrons' motion to their spin. As a result, a charge current running through a material with strong spin-orbit coupling generates a transverse spin current (spin Hall effect, SHE) and vice versa (inverse spin Hall effect, ISHE). The emergence of SHE and ISHE as charge-to-spin interconversion mechanisms offers a variety of novel spintronic functionalities and devices, some of which do not require any ferromagnetic material. However, the interconversion efficiency of SHE and ISHE (spin Hall angle) is a bulk property that rarely exceeds ten percent, and does not take advantage of interfacial and low-dimensional effects otherwise ubiquitous in spintronic hetero- and mesostructures. Here, we make use of an interface-driven spin-orbit coupling mechanism-the Rashba effect-in the oxide two-dimensional electron system (2DES) LaAlO3/SrTiO3 to achieve spin-to-charge conversion with unprecedented efficiency. Through spin pumping, we inject a spin current from a NiFe film into the oxide 2DES and detect the resulting charge current, which can be strongly modulated by a gate voltage. We discuss the amplitude of the effect and its gate dependence on the basis of the electronic structure of the 2DES and highlight the importance of a long scattering time to achieve efficient spin-to-charge interconversion.
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Affiliation(s)
- E Lesne
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - Yu Fu
- Spintec, Institut Nanosciences et Cryogenie, Univ. Grenoble Alpes, CEA, CNRS, F-38000 Grenoble, France
| | - S Oyarzun
- Spintec, Institut Nanosciences et Cryogenie, Univ. Grenoble Alpes, CEA, CNRS, F-38000 Grenoble, France
- Departamento de Física, CEDENNA, Universidad de Santiago de Chile (USACH), Avenida Ecuador 3493, 9170124 Santiago, Chile
| | - J C Rojas-Sánchez
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - D C Vaz
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - H Naganuma
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
- Tohoku University, Department of Applied Physics, 6-6-05 Aoba, Aramaki, Aoba, Sendai 980-8579, Japan
| | - G Sicoli
- Institut Nanosciences et Cryogenie, Univ. Grenoble Alpes, CEA, F-38000 Grenoble, France
| | - J-P Attané
- Spintec, Institut Nanosciences et Cryogenie, Univ. Grenoble Alpes, CEA, CNRS, F-38000 Grenoble, France
| | - M Jamet
- Spintec, Institut Nanosciences et Cryogenie, Univ. Grenoble Alpes, CEA, CNRS, F-38000 Grenoble, France
| | - E Jacquet
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - J-M George
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - A Barthélémy
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - H Jaffrès
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - A Fert
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - M Bibes
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France
| | - L Vila
- Spintec, Institut Nanosciences et Cryogenie, Univ. Grenoble Alpes, CEA, CNRS, F-38000 Grenoble, France
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Naganuma H, Ishida H, Ogawa M, Watanabe Y, Watanabe D, Ohyama Y, Watanabe T. Focal nodular hyperplasia: our experience of 53 Japanese cases. J Med Ultrason (2001) 2016; 44:79-88. [PMID: 27550510 DOI: 10.1007/s10396-016-0734-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2016] [Accepted: 07/07/2016] [Indexed: 12/11/2022]
Abstract
PURPOSE Contrast-enhanced ultrasound (CEUS) is a very sensitive diagnostic tool in characterizing liver tumors. It is especially useful in the diagnosis of focal nodular hyperplasia (FNH) of the liver. According to the previous reports, FNH is common in young women, and it is usually diagnosed by MRI. The majority of the previous reports come from European countries, and a very few studies of large series designed to describe the clinical features in Japanese patients have been reported. The aim of this study was to (a) describe the clinical features in 53 patients (59 lesions) diagnosed with CEUS and (b) compare the data with those from the previous reports. METHODS The medical data from 53 patients diagnosed on the basis of typical CEUS findings at our institution and affiliated hospitals were reviewed, and their clinical data were analyzed. RESULTS (1) The medical data from 53 cases showed a slight male predilection, with 30 male cases (57 %) and 23 female cases (43 %), although the occurrence in both sexes was equal. FNH cases were distributed throughout all generations in both sexes, mostly concentrated in the age of 30-60 years old, and metabolic cases were more common in men than in women (4 vs 0). (2) The lesions were small (mean: 23 mm) and distributed throughout the whole liver. (3) Lesion size was not influenced by age in either sex. (4) A rapid draining to the hepatic vein was recognized in five out of 59 lesions (8 %). CONCLUSIONS Our data indicate that FNH occurs slightly more frequently in men than in women in Japan. It occurs also at any age in both sexes, but the mean lesion size was smaller in our series than in the previous reports. Metabolic disease was seen only in male FNH patients. A direct communication between the FNH lesion and the hepatic vein is diagnostically worth noting.
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Affiliation(s)
- Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, Yokote, Japan.
| | - Hideaki Ishida
- Center of Diagnostic Ultrasound, Akita Red Cross Hospital, Akita, Japan
| | - Masahiro Ogawa
- Department of Gastroenterology and Hepatology, Nihon University Hospital, Tokyo, Japan
| | - Yukinobu Watanabe
- Department of Gastroenterology and Hepatology, Nihon University Hospital, Tokyo, Japan
| | - Daisuke Watanabe
- Department of Gastroenterology, Noshiro Ishikai Hospital, Noshiro, Japan
| | - Yoko Ohyama
- Department of Medical Laboratory, Akita Kousei Medical Center, Akita, Japan
| | - Takako Watanabe
- Center of Diagnostic Ultrasound, Akita Red Cross Hospital, Akita, Japan
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Uno A, Ishida H, Konno K, Hamashima Y, Naganuma H, Komatsuda T, Sato M, Shindoh K, Oyake J, Watanabe S. Errors in measuring blood flow velocity behind hepatic mass lesions using color doppler sonography. J Med Ultrason (2001) 2016; 30:133-40. [PMID: 27278303 DOI: 10.1007/bf02481218] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2002] [Accepted: 12/18/2002] [Indexed: 12/21/2022]
Abstract
The authors designed microcomputer simulation models to investigate the combined effect of a distorted grayscale ultrasound image and an inaccurately measured Doppler angle on the accuracy of measurement of blood-flow velocity in vessels located behind mass lesions in the liver. Error decreased when flow was measured at the midpoint of the posttumoral segment of the vessel and increased with distance between the mass and the vessel, with inclination of the vessel, and with decrease in the diameter of the mass. Error was least with the sector probe, intermediate with the convex probe, and greatest with the linear probe. These findings suggest that the error can be minimized when measuring blood flow velocity in a vessel located behind a mass, if the Doppler images are acquired using a sector probe from the midpoint of the posttumoral segment of the vessel.
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Affiliation(s)
- Atsushi Uno
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.,Department of Gastroenterology Akita Medical Center, 6-17, Senshu-Kubota-machi, Akita, Japan
| | - Hideaki Ishida
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.,Center of Diagnostic Ultrasound Akita Red Cross Hospital, 222-1, Saruta, Kamikitade, Akita, Japan
| | - Kei Konno
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan
| | - Yuki Hamashima
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan
| | - Hiroko Naganuma
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan
| | - Tomoya Komatsuda
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.,Center of Diagnostic Ultrasound Akita Red Cross Hospital, 222-1, Saruta, Kamikitade, Akita, Japan
| | - Michiko Sato
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan
| | - Kenichi Shindoh
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan
| | - Jinko Oyake
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan.,Center of Diagnostic Ultrasound Akita Red Cross Hospital, 222-1, Saruta, Kamikitade, Akita, Japan
| | - Sumio Watanabe
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan
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Naganuma H, Funaoka M, Fujimori S, Ishida H, Komatsuda T, Yamada M, Furukawa K. Hepatic cyst with intracystic bleeding: contrast-enhanced sonographic findings. J Med Ultrason (2001) 2016; 33:105-7. [PMID: 27277729 DOI: 10.1007/s10396-005-0084-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2005] [Accepted: 12/15/2005] [Indexed: 01/28/2023]
Abstract
Intracystic bleeding is a relatively rare complication of hepatic cysts, which is very difficult to diagnose by conventional sonography (US). Hence, a new US technique has been sought for this purpose. We present the case of a hepatic cyst with intracystic bleeding in which contrast-enhanced US showed microbubbles oozing from the cyst wall into the cystic cavity. Contrast-enhanced US is now an important diagnostic tool for diagnosing liver tumors, but contrast-enhanced US findings relating to intracystic bleeding have not been reported. Our observations suggest that this technique may be a useful new diagnostic tool for this purpose.
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Affiliation(s)
- Hiroko Naganuma
- Department of Internal Medicine, Yokote Municipal Hospital, Akita, Japan
| | - Masato Funaoka
- Department of Internal Medicine, Yokote Municipal Hospital, Akita, Japan
| | - Syuusei Fujimori
- Department of Internal Medicine, Yokote Municipal Hospital, Akita, Japan
| | - Hideaki Ishida
- Center of Diagnostic Ultrasound, Red Cross Hospital, 222-1, Saruta, Kamikitade, Akita, 010-1495, Japan.
| | - Tomoya Komatsuda
- Center of Diagnostic Ultrasound, Red Cross Hospital, 222-1, Saruta, Kamikitade, Akita, 010-1495, Japan
| | - Mamiko Yamada
- Center of Diagnostic Ultrasound, Red Cross Hospital, 222-1, Saruta, Kamikitade, Akita, 010-1495, Japan
| | - Kayoko Furukawa
- Center of Diagnostic Ultrasound, Red Cross Hospital, 222-1, Saruta, Kamikitade, Akita, 010-1495, Japan
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25
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Naganuma H, Nagai H, Ishida H. Searchlight phenomenon: a novel artifact of the gallbladder. J Med Ultrason (2001) 2016; 43:219-25. [PMID: 26748504 DOI: 10.1007/s10396-015-0697-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Accepted: 12/15/2015] [Indexed: 01/11/2023]
Abstract
BACKGROUND "Searchlight phenomenon" is an ultrasound artifact that appears as thin, bright, and posteriorly extending lines in the gallbladder lumen. It mimicks the comet-tail artifact, but it does not decrease in intensity in the depth of the view field, unlike the comet-tail artifact. PURPOSE To determine the mechanism of this unpublished ultrasound artifact on the basis of clinical ultrasound images as well as using an in vitro system. MATERIALS AND METHODS (1) CLINICAL STUDY: to determine the detection rate of the searchlight phenomenon in 453 subjects with a normal abdominal US examination result according to the medical chart. We also analyzed the appearance of the searchlight phenomenon in which US showed the searchlight phenomenon in the gallbladder. (2) Basic study: we placed a thin (thickness: 12 μm) polyethylene membrane at the depth of 2.5 cm from the transducer inside a water bath. Then, we inserted air bubbles (50-400 μm) below the membrane and observed when the ring-down artifact and searchlight phenomenon appeared. RESULTS (1) CLINICAL STUDY: the searchlight phenomenon was observed in 30 out of 453 (6.6 %) subjects. When the searchlight phenomenon was seen, duodenal gas was present dorsally in the same line of sight, and the searchlight phenomenon appeared only when duodenal gas was accompanied by the ring-down artifact on US. (2) Basic study: a stepwise increase in the number of air bubbles gave rise to (a) multiple echo spots (single layer of air bubbles), (b) ring-down artifact (two layers), and (c) ring-down artifact below the membrane and searchlight phenomenon in front of the membrane simultaneously. The ring-down artifact and searchlight phenomenon always appeared in the same line of sight. CONCLUSION The searchlight phenomenon is thought to be a range-ambiguity artifact of the ring-down artifact. Duodenal gas is thought to give rise to this artifact. When examining the gallbladder with ultrasound, knowledge of many artifacts including the searchlight phenomenon can prevent us from making a hazardous misdiagnosis.
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Affiliation(s)
- Hiroko Naganuma
- Department of Gastroenterology, Yokote Municipal Hospital, 5-31 Negishi, Yokote, Akita, 013-8602, Japan.
| | - Hiroshi Nagai
- New Generation Imaging Laboratory, 4-29-18 Hamadayama, Suginami, Tokyo, 168-0065, Japan
| | - Hideaki Ishida
- Center of Diagnostic Ultrasound, Akita Red Cross Hospital, 222-1 Kamikitate, Akita, Akita, 010-1495, Japan
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Pirro P, Sebastian T, Brächer T, Serga AA, Kubota T, Naganuma H, Oogane M, Ando Y, Hillebrands B. Non-Gilbert-damping Mechanism in a Ferromagnetic Heusler Compound Probed by Nonlinear Spin Dynamics. Phys Rev Lett 2014; 113:227601. [PMID: 25494091 DOI: 10.1103/physrevlett.113.227601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Indexed: 06/04/2023]
Abstract
The nonlinear decay of propagating spin waves in the low-Gilbert-damping Heusler film Co_{2}Mn_{0.6}Fe_{0.4}Si is reported. Here, two initial magnons with frequency f_{0} scatter into two secondary magnons with frequencies f_{1} and f_{2}. The most remarkable observation is that f_{1} stays fixed if f_{0} is changed. This indicates, that the f_{1} magnon mode has the lowest instability threshold, which, however, cannot be understood if only Gilbert damping is present. We show that the observed behavior is caused by interaction of the magnon modes f_{1} and f_{2} with the thermal magnon bath. This evidences a significant contribution of the intrinsic magnon-magnon scattering mechanisms to the magnetic damping in high-quality Heusler compounds.
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Affiliation(s)
- P Pirro
- Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - T Sebastian
- Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - T Brächer
- Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany and Graduate School Materials Science in Mainz, Gottlieb-Daimler-Straße 47, Germany
| | - A A Serga
- Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - T Kubota
- Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
| | - H Naganuma
- Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-05, Sendai 980-8579, Japan
| | - M Oogane
- Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-05, Sendai 980-8579, Japan
| | - Y Ando
- Department of Applied Physics, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-05, Sendai 980-8579, Japan
| | - B Hillebrands
- Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
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Hongo M, Ishida H, Naganuma H, Yoshioka H, Kasuya T, Niwa M. A case of gallbladder perforation detected by sonography after a blunt abdominal trauma. J Clin Ultrasound 2014; 42:301-304. [PMID: 24151110 DOI: 10.1002/jcu.22111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 06/14/2013] [Accepted: 09/10/2013] [Indexed: 06/02/2023]
Abstract
Gallbladder (GB) perforation is a very rare posttraumatic abdominal injury. It is potentially life-threatening, and good outcome requires early diagnosis. We present a case of isolated posttraumatic GB perforation in which the precise sonographic (US) diagnosis led us to apply proper management. Color Doppler US showed a clear to-and-fro flow signal passing through the perforation site, and contrast-enhanced US confirmed the presence of a small defect in the GB wall. When examining posttraumatic patients, the possibility of GB perforation must be kept in mind. Color Doppler US and contrast-enhanced US are the examinations of choice to detect the perforation site and show bile movement through the perforation.
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Affiliation(s)
- Maiko Hongo
- Department of Surgery, Yokote Municipal Hospital, 5-31 Negishi-cho, Yokote-shi, Akita, 013-8602, Japan
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Sebastian T, Brächer T, Pirro P, Serga AA, Hillebrands B, Kubota T, Naganuma H, Oogane M, Ando Y. Nonlinear emission of spin-wave caustics from an edge mode of a microstructured Co2Mn(0:6)Fe(0:4)Si waveguide. Phys Rev Lett 2013; 110:067201. [PMID: 23432296 DOI: 10.1103/physrevlett.110.067201] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Indexed: 06/01/2023]
Abstract
Magnetic Heusler materials with very low Gilbert damping are expected to show novel magnonic transport phenomena. We report nonlinear generation of higher harmonics leading to the emission of caustic spin-wave beams in a low-damping microstructured Co(2)Mn(0.6)Fe(0.4)Si Heusler waveguide. The source for the higher harmonic generation is a localized edge mode formed by the strongly inhomogeneous field distribution at the edges of the spin-wave waveguide. The radiation characteristics of the propagating caustic waves observed at twice and three times the excitation frequency are described by an analytical calculation based on the anisotropic dispersion of spin waves in a magnetic thin film.
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Affiliation(s)
- T Sebastian
- Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany.
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Mizukami S, Wu F, Sakuma A, Walowski J, Watanabe D, Kubota T, Zhang X, Naganuma H, Oogane M, Ando Y, Miyazaki T. Long-lived ultrafast spin precession in manganese alloys films with a large perpendicular magnetic anisotropy. Phys Rev Lett 2011; 106:117201. [PMID: 21469891 DOI: 10.1103/physrevlett.106.117201] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Indexed: 05/25/2023]
Abstract
Spin precession with frequencies up to 280 GHz is observed in Mn(3-δ)Ga alloy films with a perpendicular magnetic anisotropy constant K(u)∼15 M erg/cm(3). The damping constant α, characterizing macroscopic spin relaxation and being a key factor in spin-transfer-torque systems, is not larger than 0.008 (0.015) for the δ=1.46 (0.88) film. Those are about one-tenth of α values for known materials with large K(u). First-principles calculations well describe both low α and large K(u) for these alloys.
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Affiliation(s)
- S Mizukami
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
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Naganuma H, Ishida H, Funaoka M, Fujimori S, Okuyama A, Odashima M, Takeuchi S, Hanaoka A. Mobile echoes in liver cysts: a form of range-ambiguity artifact. J Clin Ultrasound 2010; 38:475-479. [PMID: 20848575 DOI: 10.1002/jcu.20746] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
PURPOSE Faint moving echoes are occasionally encountered in large hepatic cysts, as an example of range-ambiguity artifacts. The aim of this article is to describe the pattern of these intracystic mobile echoes, to analyze the mechanism of their formation, and to discuss options to clear them. METHODS We analyzed the size and location of the hepatic cysts, the movement of the artifactual echoes, and the relationship between pulse repetition frequency (PRF) and the depth of these intracystic mobile echoes in 10 cases. In three cases examination at a lower PRF was made to ascertain whether the artifactual echoes would disappear. RESULTS Intracystic range-ambiguity echoes appeared when the heart was located distal to the hepatic cyst and these echoes moved according to cardiac motion. The depth of the intracystic artifacts changed according to the PRF and they disappeared at a low PRF. CONCLUSION Intracystic range-ambiguity artifacts are caused by an erroneous display of the returning echoes from the heart. Knowledge of the mechanism and appearance of this artifact helps prevent misdiagnosis of internal echoes in large hepatic cysts. Observation at different PRFs is key to recognizing this artifact, and examination at lower PRFs should be done to confirm the artifactual nature of the echoes.
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Affiliation(s)
- Hiroko Naganuma
- Internal Medicine, Yokote Municipal Hospital, Yokote-shi, Akita, Japan
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Kim G, Hiratsuka T, Naganuma H, Oogane M, Ando Y. Magnetoresistance of perpendicularly magnetized tunnel junction usingL10-CoNiPt with low saturation magnetization. ACTA ACUST UNITED AC 2010. [DOI: 10.1088/1742-6596/200/5/052011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Haijima N, Kawahito K, Abe T, Hanai M, Naganuma H, Taguchi S, Hashimoto K. [Treatment of a massive tracheal bleeding with percutaneous cardiopulmonary support]. Kyobu Geka 2008; 61:1092-1095. [PMID: 19068693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A 69-year-old woman was admitted to our hospital with heart failure. Echocardiography demonstrated severe mitral valve regurgitation due to chordae rupture of the posterior mitral leaflet. Although she was intubated and ventilation was initiated, her condition did not improve. On the 17th hospital day, she was scheduled to undergo mitral valve plasty. After induction of anesthesia, massive bleeding occurred from the tracheal granuloma (diameter, 3 cm), which had developed at the tip of the tracheal tube, and the airway was obstructed. Emergency percutaneous cardiopulmonary support (PCPS) was then introduced. Thereafter, endoscopic hemostasis was performed, followed by the excision of the granulation tissue using a gastric fiberscope. After excising the tissue, the patient could be ventilated; therefore, she was weaned from PCPS. The maximum PCPS flow was 4.0 l/min, and it was conducted for a 210-minutes duration. Her respiratory condition improved, and she was weaned from the ventilator 3 days after surgery. Mitral valve plasty was performed 55 days after the first operation, and she was discharged from the hospital in good health.
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Affiliation(s)
- N Haijima
- Department of Cardiovascular Surgery, The Jikei University School of Medicine, Kashiwa Hospital, Kashiwa, Japan
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Abe T, Kawahito K, Naganuma H, Hanai M, Mashiko K, Hashimoto K. [Reoperation due to failure of a Freestyle bioprosthesis]. Kyobu Geka 2008; 61:545-548. [PMID: 18616098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report re-do aortic valve and ascending aorta replacements by using the valve-on-valve technique for primary tissue failure of a Freestyle bioprosthesis. A 74-year-old male, who had had a 25 mm Freestyle bioprosthetic valve implanted by the sub-coronary method 5 years previously for aortic valve regurgitation due to congenital bicuspid valve, was referred to our hospital for dyspnea and palpitation. He presented with heart failure secondary to aortic regurgitation due to primary tissue failure, and computed tomography demonstrated an enlarged ascending aorta (5 cm in diameter). The operative findings revealed that the Freestyle bioprosthetic valve had a leaflet tear at the left coronary cusp. We replaced the degenerated Freestyle bioprosthesis with a 19 mm Mosaic aortic bioprosthesis by using the valve-on-valve technique, and ascending aorta replacement was performed simultaneously. This technique can be useful for re-do surgery for degenerated stentless valves to avoid potential risks of complete excision of the bioprosthesis.
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Affiliation(s)
- T Abe
- Department of Cardiovascular Surgery, Jikei University School of Medicine, Kashiwa Hospital, Kashiwa, Japan
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Naganuma H, Okubo T, Kamishima K, Kakizaki K, Hiratsuka N, Okamura S. Ferroelectric and magnetic properties of multiferroic BiFeO(3)-based composite films. IEEE Trans Ultrason Ferroelectr Freq Control 2008; 55:1051-1055. [PMID: 18519211 DOI: 10.1109/tuffc.2008.755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
BiFeO(3)-based composite films were fabricated onto the Pt/Ti/SiO(2)/Si(100) substrates by a chemical solution deposition (CSD) method using the precursor solutions with various excess iron composition followed by annealing at 923 K for 30 minutes under oxygen gas flow. Coexistence of spontaneous magnetization and remanent polarization could be obtained in the BiFeO(3)-based composite films with high excess iron composition. The remanent magnetization of almost 20 emu/cm(3) and the magnetic coercive field of 1.5 kOe were obtained at the iron composition ratio of Fe/Bi = 1.25. In this specimen, the remanent polarization at 90 K was approximately 10 microC/cm(2) at the electric field of 1500 kV/cm. Structural analysis suggested that the remanent polarization has a possibility to increase by suppressing the formation of the secondary phases of Bi(2)Fe(4)O(9) and alpha-Fe(2)O(3), these are the nonferroelectric material as well as antiferromagnetic phase.
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Affiliation(s)
- H Naganuma
- Department of Applied Physics Tokyo University of Science, Shinjuku-ku, Tokyo 162-8601, Japan.
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Naganuma H, Inoue Y, Okamura S. Dependence of ferroelectric and magnetic properties on measuring temperatures for polycrystalline BiFeO(3) films. IEEE Trans Ultrason Ferroelectr Freq Control 2008; 55:1046-1050. [PMID: 18519210 DOI: 10.1109/tuffc.2008.754] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A multiferroic BiFeO(3) film was fabricated on a Pt/Ti/SiO(3)/Si(100) substrate by a chemical solution deposition (CSD) method, and this was followed by postdeposition annealing at 923 K for 10 min in air. X-ray diffraction analysis indicated the formation of the polycrystalline single phase of the BiFeO(3) film. A high remanent polarization of 89 microC/cm(2) was observed at 90 K together with a relatively low electric coercive field of 0.32 MV/cm, although the ferroelectric hysteresis loops could not be observed at room temperature due to a high leakage current density. The temperature dependence of the ferroelectric hysteresis loops indicated that these hysteresis loops lose their shape above 165 K, and the nominal remanent polarization drastically increased due to the leakage current. Magnetic measurements indicated that the saturation magnetization was less than 1 emu/cm(3) at room temperature and increased to approximately 2 emu/cm(3) at 100 K, although the spontaneous magnetization could not appear. The magnetization curves of polycrystalline BiFeO3 film were nonlinear at both temperatures, which is different with BiFeO3 single crystal.
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Affiliation(s)
- H Naganuma
- Department of Applied Physics, Tokyo University of Science, Tokyo, Japan.
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Naganuma H, Funaoka M, Fujimori S, Niwa M, Hirano H, Ishida H, Komatsuda T, Yamada M. Rupture of liver metastasis: report of a case with an emphasis on contrast-enhanced US. J Med Ultrason (2001) 2007; 34:113-6. [PMID: 27278295 DOI: 10.1007/s10396-007-0140-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2007] [Accepted: 03/07/2007] [Indexed: 12/15/2022]
Abstract
We present a case of liver metastasis from an uterine leiomyosarcoma in which contrast-enhanced ultrasonography (CEUS) helped determine the bleeding point and prevented a delay in devising diagnostic and therapeutic strategies. CEUS allowed us to differentiate active from nonactive bleeding on the basis of presence or absence of contrast extravasation in the ascites. CEUS is the first examination performed when liver tumor rupture is suspected. Reference to the preangiographic CEUS results is expected to provide a road map for angiography.
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Affiliation(s)
- Hiroko Naganuma
- Department of Internal Medicine, Yokote Municipal Hospital, 5-31 Negishi-cho, Yokote, Akita, 013-8602, Japan.
| | - Masato Funaoka
- Department of Internal Medicine, Yokote Municipal Hospital, 5-31 Negishi-cho, Yokote, Akita, 013-8602, Japan
| | - Shusei Fujimori
- Department of Internal Medicine, Yokote Municipal Hospital, 5-31 Negishi-cho, Yokote, Akita, 013-8602, Japan
| | - Makoto Niwa
- Department of Surgery, Yokote Municipal Hospital, Akita, Japan
| | - Hiroko Hirano
- Department of Radiology, Yokote Municipal Hospital, Akita, Japan
| | - Hideaki Ishida
- Center of Diagnostic Ultrasound, Akita Red Cross Hospital, Akita, Japan
| | - Tomoya Komatsuda
- Center of Diagnostic Ultrasound, Akita Red Cross Hospital, Akita, Japan
| | - Mamiko Yamada
- Center of Diagnostic Ultrasound, Akita Red Cross Hospital, Akita, Japan
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Naganuma H, Funaoka M, Fujimori S, Niwa M, Ishida H, Komatsuda T, Yamada M, Furukawa K. Contrast-enhanced sonographic findings in a case of hepatobiliary cystadenoma with intracystic bleeding. J Clin Ultrasound 2006; 34:412-5. [PMID: 16944488 DOI: 10.1002/jcu.20262] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Intracystic slow bleeding is very difficult to diagnose using conventional sonography; consequently, a new sonographic technique has been sought. We present a histologically proven hepatobiliary cystadenoma with intracystic bleeding in which contrast-enhanced sonography (CEUS) showed microbubbles oozing from the cyst wall into the cystic cavity 10 minutes after intravenous injection of contrast medium. CEUS is an important diagnostic tool for diagnosing liver tumors, but the CEUS finding of slow intracystic bleeding has not been reported. Our observation suggests that this technique may be a new diagnostic tool for this purpose.
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Affiliation(s)
- Hiroko Naganuma
- Department of Internal Medicine, Yokote Municipal Hospital, 5-31 Negishi-cho, Yokote, Akita, Japan
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Naganuma H, Mashiko K, Hanai M, Abe T. [Multiple acute aortic dissection; report of a case]. Kyobu Geka 2006; 59:241-3. [PMID: 16529000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
A 60-year-old woman has been followed under the diagnosis of De Bakey type Illb acute aortic dissection. She developed sudden backache, and the diagnosis based on the emergent computed tomography (CT) was De Bakey type I dissection. At the operation, previous De Bakey type Illb dissection was far from the new dissection observed in the ascending aorta and arch aorta. We replaced the ascending aorta and aortic arch with woven Dacron graft (arch first technique) under retrograde cerebral perfusion. Since the residual dissection (De Bakey type III) in the multiple aortic dissection has tendency to dilate fast, intensive follow-up of the patient would be necessary.
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Affiliation(s)
- H Naganuma
- Department of Cardiac Surgery, the Jikei University Kashiwa Hospital, Kashiwa, Japan
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Watanabe A, Horikoshi T, Naganuma H, Satoh E, Nukui H. Intramedullary spinal cord germinoma expresses the protooncogene c-kit. Acta Neurochir (Wien) 2005; 147:303-8; discussion 308. [PMID: 15662572 DOI: 10.1007/s00701-004-0450-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
A 33-year-old woman first noticed numbness in the both lower extremities and the numbness gradually extended up to the thorax. Magnetic resonance (MR) imaging demonstrated a mass with moderate and heterogeneous enhancement and peritumoural intramedullary cysts in the spinal cord at the T-1 to T-3 levels. The tumour was explored partially and intra-operative pathological examination demonstrated the so-called "two-cell pattern" typical of germinoma. The margin of the tumour was not clear. Histological examination showed germinoma with strong c-kit protein expression on the tumour cell surface. Chemotherapy and radiation therapy were given following surgery. Her neurological deficits were improved but not resolved.
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Affiliation(s)
- A Watanabe
- Department of Neurosurgery, Faculty of Medicine, University of Yamanashi, Nakagoma-gun, Yamanashi, Japan
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Komatsuda T, Ishida H, Konno K, Hamashima Y, Naganuma H, Sato M, Suzuki T, Shindoh K, Watanabe S. Differentiation of exudate from transudate ascites by Doppler sonography. Abdom Imaging 2003; 28:609-13. [PMID: 14628860 DOI: 10.1007/s00261-002-0087-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND We investigated whether the addition of Doppler sonography (US) increases the diagnostic confidence of US for estimating the nature of ascites. METHODS Of the 127 cases reviewed in this study, there were 42 cases of transudate and 85 of exudate ascites. We reviewed the US, power Doppler, and pulsed Doppler images of these cases. RESULTS With US, the transudate ascites was imaged as free of echo in 38 of 42 cases (90.5%). The exudate ascites was imaged as free of echo in 22 of 85 cases (25.9%) and with internal echo spots in 63 of 85 cases (74.1%). With Doppler US, we obtained distinct pulsed signals from the transudate ascites in only two of 36 cases (5.6%). In contrast, we obtained distinct Doppler signals from the exudate ascites in 66 of 79 cases (83.5%). Those 66 cases included 16 of the 22 cases with echo-free ascites. CONCLUSION The presence or absence of echo spots within the ascites helped differentiate transudate from exudate ascites, as reported in the literature. However, the addition of Doppler US contributed to the differentiation of echo-free exudate (Doppler signals present) from echo-free transudate (Doppler signals absent) ascites.
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Affiliation(s)
- T Komatsuda
- Center of Diagnostic Ultrasound, Red Cross Hospital, 222-1, Saruta Kamikitade, Akita, Japan
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Konno K, Ishida H, Komatsuda T, Naganuma H, Sato M, Hamashima Y, Watanabe S. Image distortion in US-guided liver tumor puncture with curved linear array. Eur Radiol 2003; 13:1291-6. [PMID: 12764644 DOI: 10.1007/s00330-002-1711-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2001] [Revised: 05/23/2002] [Accepted: 08/20/2002] [Indexed: 12/21/2022]
Abstract
Our objective was to systematically examine the influence of probe geometry, puncture route, and composition of the abdominal wall on the deviation error with needle display. We made a simplified simulation model of the puncture needle passing to the liver tumor, using a microcomputer system, and visualized the degree of distortion of the puncture needle, changing the thickness and component of the abdominal wall as well as the radius of the probe, site, and angle of puncture. The puncture needle exhibited a displacement error of -10.9 to 3.8 mm (center hole) and -11.3 to 3.8 mm (side attachment). The shift was less accentuated when the radius of the probe was large. The displacement error was less accentuated in the center and accentuated in the left side of the field of view. It is recommended that liver puncture under US guidance be generally performed using a probe with a larger radius through the center hole with the most obtuse puncture angle possible, but when the tumor is localized in the hepatic dome, a more tightly curved probe should be used with an acute angle. We must consider a possible large error in display of the puncture needle during liver puncture and try to prevent hazardous complications.
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Affiliation(s)
- Kei Konno
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita City, Akita 010-8543, Japan.
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Arizono Y, Yoshikawa H, Naganuma H, Hamada Y, Nakajima Y, Tasaka K. A mechanism of resistance to TRAIL/Apo2L-induced apoptosis of newly established glioma cell line and sensitisation to TRAIL by genotoxic agents. Br J Cancer 2003; 88:298-306. [PMID: 12610517 PMCID: PMC2377044 DOI: 10.1038/sj.bjc.6600666] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Most tumour cells are sensitive to TRAIL-induced apoptosis, but not normal cells; thus, cancer therapy using TRAIL is expected clinically. Several tumour cells are resistant to TRAIL-induced apoptosis, and various mechanisms of such resistance were reported in individual cases. In this study, we established a TRAIL-resistant glioma cell line, which completely lacked TRAIL receptors. In addition, this tumour cell line had wild-type p53 tumour-suppressive gene, suggesting new mechanisms for tumour cells to expand and escape from immune surveillance. The present study further explored the mechanisms that determine the sensitivity to TRAIL. We show that genotoxic agents such as cisplatin, doxorubicin and camptothecin, in addition to UV radiation, can induce TRAIL-R2 on the cell surface of TRAIL receptor-negative tumour cells. Newly synthesised TRAIL-R2 is functional, so apoptosis is effectively induced by TRAIL, but it is significantly inhibited by constitutive expression of dominant-negative p53. In addition, apoptosis induced by pretreatment of genotoxic agents and additional stimulation of TRAIL is efficiently inhibited by either antagonistic anti-TRAIL-R2 antibody or pan-caspase inhibitor z-VAD-FMK. Taken together, these findings suggest that resistance to TRAIL by lack of TRAIL receptors on glioma is restored by genotoxic agents, which support the new strategies for tumour killing by TRAIL-bearing cytotoxic cells in combination with genotoxic treatment.
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Affiliation(s)
- Y Arizono
- Department of Orthopedic Surgery, Yamanashi Medical University, 1110 Shimokato, Tamaho-cho, Yamanashi 409-3898, Japan
| | - H Yoshikawa
- Department of Parasitology & Immunology, Yamanashi Medical University, 1110 Shimokato, Tamaho-cho, Yamanashi 409-3898, Japan
| | - H Naganuma
- Department of Neurosurgery, Yamanashi Medical University, 1110 Shimokato, Tamaho-cho, Yamanashi 409-3898, Japan
| | - Y Hamada
- Department of Orthopedic Surgery, Yamanashi Medical University, 1110 Shimokato, Tamaho-cho, Yamanashi 409-3898, Japan
| | - Y Nakajima
- Department of Parasitology & Immunology, Yamanashi Medical University, 1110 Shimokato, Tamaho-cho, Yamanashi 409-3898, Japan
| | - K Tasaka
- Department of Parasitology & Immunology, Yamanashi Medical University, 1110 Shimokato, Tamaho-cho, Yamanashi 409-3898, Japan
- Department of Parasitology & Immunology, Yamanashi Medical University, 1110 Shimokato, Tamaho-cho, Yamanashi 409-3898, Japan. E-mail:
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Konno K, Ishida H, Sato M, Naganuma H, Komatsuda T, Kimura H, Ishida J, Watanabe S. Dilatation of the cystic duct in patients with obstructive jaundice. Abdom Imaging 2003; 28:75-8. [PMID: 12483390 DOI: 10.1007/s00261-001-0153-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND It is well known that obstructive jaundice causes biliary dilatation, but sonographic (US) findings of the cystic duct in patients with obstructive jaundice are rarely reported. METHODS We reviewed US findings in 25 such patients. RESULTS US findings of dilated cystic duct could be divided roughly into two patterns: tortuous and tubular. The former pattern was a tortuously dilated cystic duct arising from the gallbladder neck, running predominantly deeply, turning anteromedially, and then joining the posterior face of the common hepatic duct. The latter pattern was a straight dilated cystic duct running parallel with the common hepatic duct, giving the appearance of a septated bile duct. CONCLUSION A better understanding of the US findings of dilated cystic duct translates into improved biliary US diagnosis.
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Affiliation(s)
- K Konno
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita-City, Akita 010-8543, Japan
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Abstract
BACKGROUND Retroperitoneal cyst (RC) is a relatively rare disease, and its sonographic (US) findings have not been analyzed sufficiently. METHODS We studied US findings of five patients with RC, with special attention to location, size, shape, internal echoes, the presence or absence of lateral shadowing, and the mode of back echoes. RESULTS In all cases, the cyst was situated behind (four cases) or lateral to (one case) the pancreas: behind or lateral to the pancreatic head in two cases, behind the pancreatic body in one case, and behind the pancreatic tail in two cases. Four cases showed a round mass (three cases) or multiple round mass (one case). Internal echoes were present in those cases and showed a "pseudo-solid" pattern. In those cases, M-mode US confirmed the movement of those internal echoes. In the remaining case, the lesion was imaged as an irregularly shaped multilocular mass. No case showed posterior echo enhancement, and no case showed lateral shadowing. No blood flow signals from the lesion were seen. CONCLUSION Unlike ordinary cysts, RC usually is imaged as a round mass behind the pancreas, with dense internal echoes without lateral shadowing or posterior echo enhancement, which presents a "pseudo-solid" pattern. A diagnosis of RC should be considered when encountering a mass with such US findings.
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Affiliation(s)
- K Konno
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita-City, Akita 010-8543, Japan
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Ishida H, Konno K, Ishida J, Naganuma H, Komatsuda T, Sato M, Watanabe S. Abdominal lymphoma: differentiation from pancreatic carcinoma with Doppler US. Abdom Imaging 2002; 27:461-4. [PMID: 12066247 DOI: 10.1007/s00261-001-0080-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND Marked lymphadenopathy around the pancreas due to lymphoma (abdominal lymphoma) occasionally can mimic a total pancreatic carcinoma on ultrasonography (US). We investigated whether US and color Doppler US allowed differentiation between those pathologies. METHODS We analyzed the US and color Doppler results of 12 cases of abdominal peripancreatic lymphoma and 21 cases of total pancreatic carcinoma. RESULTS With regard to shape, echogenicity of the lesion, and mode of vascular involvement, there was no difference between groups. With regard to maximal velocities and resistive indices of the involved vessels, there was no difference between groups. However, the presence of turbulent flows in the involved vessels was seen exclusively in the pancreatic carcinoma group. CONCLUSION The presence or absence of turbulent flow in the involved vessels is a very important finding for differentiating abdominal lymphomas from total pancreatic carcinomas.
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Affiliation(s)
- H Ishida
- First Department of Internal Medicine, Akita University, School of Medicine, 1-1-1 Hondo, Akita 010, Japan
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Abstract
Accessory hepatic ducts are relatively rare biliary anomalies. They have been reported only sporadically, and very few reports have described their sonographic (US) findings. Our experience with two such cases suggested that a diagnosis of an accessory hepatic duct should be considered when US shows a fine tubular structure or an anechoic or hypoechoic oval mass with acoustic shadowing at the level between the hepatic hilus and the common bile duct. A good knowledge of the US findings will determine the diagnostic and therapeutic strategies.
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Affiliation(s)
- H Kimura
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan
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Hirata M, Ishida H, Konno K, Naganuma H, Nakajima K, Igarashi K, Onji M, Iuchi H, Nishiura S, Maeda T. Primary carcinoid tumor of the liver: report of two cases with an emphasis on US findings. Abdom Imaging 2002; 27:325-8. [PMID: 12173364 DOI: 10.1007/s00261-001-0069-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Primary carcinoid tumor of the liver is rare, and its sonographic (US) findings have rarely been reported. We present two histologically proven cases. Both patients were asymptomatic and huge masses, found incidentally by US, were echogenic with many cystic areas. Lesions were markedly hypervascular on color Doppler US and angiography. Thus, primary carcinoid tumor of the liver should be considered when US detects this type of mass in asymptomatic patients.
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Affiliation(s)
- M Hirata
- Department of Internal Medicine, Johto Hospital, 2-19-36, Matsusue, Matsuyama, Japan
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Sato M, Ishida H, Konno K, Komatsuda T, Naganuma H, Segawa D, Watanabe S, Ishida J. Mesenteric lipoma: report of a case with emphasis on US findings. Eur Radiol 2002; 12:793-5. [PMID: 11960228 DOI: 10.1007/s003300101026] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2000] [Revised: 05/05/2001] [Accepted: 06/01/2001] [Indexed: 10/28/2022]
Abstract
Mesenteric lipoma (ML) is a relatively rare disease that has been very infrequently reported. We present the clinical data and medical imaging results of an asymptomatic case with ML incidentally detected by sonography (US). On US the lesion was imaged as a well-demarcated hypoechoic mass with multiple linear echoes. The mass also changed location under probe compression. The lesion was imaged as a clearly demarcated non-enhanced homogeneous fat-density mass on CT. Color Doppler US and angiography confirmed the avascular nature of the mass. Knowledge of the US findings in this case is useful for the diagnosis of ML.
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Affiliation(s)
- M Sato
- School of Medicine, Akita University, 1-1-1 Hondo, Akita, Japan
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Konno K, Ishida H, Naganuma H, Sato M, Komatsuda T, Sato A, Ishida J, Sakai T, Watanabe S. Emphysematous cholecystitis: sonographic findings. Abdom Imaging 2002; 27:191-5. [PMID: 11847580 DOI: 10.1007/s00261-001-0054-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2001] [Accepted: 04/18/2001] [Indexed: 11/25/2022]
Abstract
BACKGROUND Emphysematous cholecystitis (EC) is a rare but life-threatening complication of acute cholecystitis, and an early diagnosis is required to prevent delay in patient management. Because sonography (US) is the first choice for diagnosing gallbladder diseases, US findings of EC should be understood more precisely. METHODS We reviewed US findings of 11 surgically proven cases of EC (with small amounts of gas in three cases and large amounts in eight cases) and compared those with patients' clinical data. RESULTS (1) In cases with small amounts of gas, US showed an echogenic line with a distinct ring-down artifact or a "powder snow-like" speckled posterior echo. (2) In cases with large amounts of gas, US showed a wide spiculated echogenic band with a powder snow-like speckled posterior echo or a speckled acoustic shadowing. In all cases, the presence of gas prevented visualization of the gallbladder wall. (3) US did not differentiate gas localized to the gallbladder wall and gas extending to the surrounding hepatic tissue. (4) Two diabetic cases showed gas throughout the intrahepatic bile ducts. In those cases, the time from diagnosis to recovery was relatively long. CONCLUSION Our series showed some characteristic US patterns of EC. A good understanding of its US findings and appropriate emergent management will reduce the serious morbidity and mortality rates caused by EC.
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Affiliation(s)
- K Konno
- First Department of Internal Medicine, Akita University School of Medicine, 1-1-1 Hondo, Akita, Japan
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Nomura K, Kurosawa H, Morita K, Koyanagi K, Uno Y, Naganuma H. [Transportation for a pediatric heart transplant candidate to Germany]. Kyobu Geka 2002; 55:120-3. [PMID: 11842548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
A 8-year-old girl who underwent a total cavopulmonary connection as an one-staged repair for tricuspid atresia (Ic) had had a progressive dilated cardiomyopathy. Despite of any medical support, her left ventricular ejection fraction had been ranged from 10% to 20% since 4 months after Fontan operation. This patient was decided to apply for a heart transplantation in Germany 17 months after Fontan operation. An administration of the sufficient amount of inotropics and oxygen, volume resuscitation, reduction of the peripheral circulation at the time of take-off, and a meticulous monitoring may contribute to the successful transportation of the critically ill patient.
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Affiliation(s)
- K Nomura
- Department of Cardiovascular Surgery, Jikei University School of Medicine, Tokyo, Japan
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