Transjugular intrahepatic portosystemic shunt for acute variceal gastrointestinal bleeding: Indications, techniques and outcomes

Acute variceal bleeding is a life-threatening condition that requires a multidisciplinary approach for effective therapy. The transjugular intrahepatic portosystemic shunt (TIPS) procedure is a minimally invasive image-guided intervention used for secondary prevention of bleeding and as salvage therapy in acute bleeding. Emergency TIPS should be considered early in patients with refractory variceal bleeding once medical treatment and endoscopic sclerotherapy fail, before the clinical condition worsens. Furthermore, admission to specialized centers is mandatory in such a setting and regional protocols are essential to be organized effectively. This procedure involves establishment of a direct pathway between the hepatic veins and the portal veins to decompress the portal venous hypertension that is the source of the patient's bleeding. The procedure is technically challenging, especially in critically ill patients, and has a mortality of 30%-50% in the emergency setting, but has an effectiveness greater than 90% in controlling bleeding from gastro-esophageal varices. This review focuses on the role of TIPS in the setting of variceal bleeding, with emphasis on current indications and techniques for TIPS creation, TIPS clinical outcomes, and the role of adjuvant embolization of varices.

Anatomy of liver arteries for interventional radiology

The availability of intra-arterial hepatic therapies (radio and/or chemo-embolisation, intra-arterial hepatic chemotherapy) has convinced radiologists to perfect their knowledge of the anatomy of the liver arteries. These sometimes, complex procedures most often require selective arterial catheterization. Knowledge of the different arteries in the liver and the peripheral organs is therefore essential to optimize the procedure and avoid eventual complications. This paper aims to describe the anatomy of the liver arteries and the variants, applying it to angiography images, and to understand the implications of such variations in interventional radiological procedures.

Liver segmentation: practical tips

The liver segmentation system, described by Couinaud, is based on the identification of the three hepatic veins and the plane passing by the portal vein bifurcation. Nowadays, Couinaud's description is the most widely used classification since it is better suited for surgery and more accurate for the localisation and monitoring of intra-parenchymal lesions. Knowledge of the anatomy of the portal and venous system is therefore essential, as is knowledge of the variants resulting from changes occurring during the embryological development of the vitelline and umbilical veins. In this paper, the authors propose a straightforward systematisation of the liver in six steps using several additional anatomical points of reference. These points of reference are simple and quickly identifiable in any radiological examination with section imaging, in order to avoid any mistakes in daily practice. In fact, accurate description impacts on many diagnostic and therapeutic applications in interventional radiology and surgery. This description will allow better preparation for biopsy, portal vein embolisation, transjugular intrahepatic portosystemic shunt, tumour resection or partial hepatectomy for transplantation. Such advance planning will reduce intra- and postoperative difficulties and complications.

[Role of percutaneous arterial embolization in renal pathology]

Therapeutic embolization in renal pathology is used for various conditions in cancerology, traumatology, urology, nephrology and for iatrogenic complications of percutaneous manoeuvers. Any department of vascular radiology may be requested to use this technique, especially in emergent traumatology or palliative cancerology. The authors study the various conditions that may benefit from these procedures and give the highlights of the main indications and the main types of embolic agents used. Complications, side effects and the major precautions are also reviewed.

[Uterine artery embolization with resorbable material prior to myomectomy]

PURPOSE

Fibroids are a frequent cause of gynecology referral. Myomectomy is a conservative treatment alternative. The main risk from this procedure is hemorrhage. The main objective of this study was to demonstrate the efficacy of preoperative uterine artery embolization with resorbable agents to reduce blood losses and facilitate myomectomy. Secondary objectives were to evaluate morbidity and subsequent fertility.

PATIENTS AND METHODS

Retrospective study of 21 patients with preoperative uterine artery embolization prior to myomectomy at the University Medical Center of Dijon over a 3 year period.

RESULTS

Myomectomy after uterine artery embolization with resorbable agents was associated with only minimal blood loss. Mean preoperative and postoperative hemoglobin levels were comparable (p<0.0001). Uterine suturing was technically simpler. The number of resected fibroids (p=0.2824) and the presence of preoperative anemia (p=0.474) had no statistically significant impact on the duration of hospital stay. Uterine synechiae occurred in three patients after the procedure, and were easily treated. Two patients had normal subsequent pregnancies.

CONCLUSION

Preoperative uterine artery embolization with resorbable agents was effective in reducing surgical blood losses. This technique reduces the number of hysterectomies and hemorrhagic complications (hematoma, infection, weaker scar tissue). It should be considered in patients wishing uterine preservation when the hemorrhagic risk is high. Its use in patients seeking subsequent pregnancy should be further assessed with larger series.

[Xanthogranulomatous pyelonephritis: main imaging features]

Xanthogranulomatous pyelonephritis is a rare form of chronic pyelonephritis, which frequently has a pseudotumoral appearance, as a result of which differential diagnosis with malignant renal neoplasia is difficult, especially as there are no specific signs of this lesion. The aim of this article is to notice the various histological, clinical and radiological characteristics, and the different modalities of diagnostic and treatment of this affection.

Xanthogranulomatous pyelonephritis in adults: clinical and radiological findings in diffuse and focal forms

AIM

To describe the clinical and radiological features of focal and diffuse xanthogranulomatous pyelonephritis (XGP) in adults.

MATERIALS AND METHODS

A retrospective review of the clinical data, laboratory findings, imaging features, and surgical treatment of 13 cases of histologically proven XGP diagnosed between January 1993 and December 2005 was undertaken. There were 10 women and three men with a mean age of 55.2 years (range 30-87 years). All patients underwent both sonography and computed tomography (CT) of the kidneys. Magnetic resonance imaging (MRI) was performed in two patients.

RESULTS

XGP was diffuse in 11 patients and focal in two patients. Fever, anorexia and weight loss, urinary symptoms, and flank pain were the most common manifestations. Urinary tract infection was found in eight patients. Sonography and CT showed diffuse kidney enlargement in seven cases and atrophy in five cases; a solitary solid mass was found in two patients. Hydronephrosis was noted in nine cases, staghorn calculus in six, and extensive pararenal disease in six. MRI failed to provide the preoperative diagnosis in the two patients with focal XGP. Total or partial nephrectomy was performed without postoperative complications.

CONCLUSION

Although rare, XGP is the main differential diagnosis of malignant renal neoplasia. The definitive diagnosis depends on histological examination of the operative specimen. Preoperatively, the diagnosis can often be suspected based on imaging studies, primarily CT.

Diffuse xanthogranulomatous pyelonephritis with psoas abscess in a pregnant woman

We report the first case, to our knowledge, of xanthogranulomatous pyelonephritis (XGP) with psoas abscess occurring during pregnancy. A 37-year-old woman in the third trimester of pregnancy presented with low back pain and a fever. From sonographic features, a multidisciplinary team decided to perform computed tomography of the abdomen with contrast agent injection, which strongly suggested diffuse XGP of the left kidney with a psoas abscess. Cesarean section at 32 weeks was followed by extended nephrectomy. Pathological examination of the operative specimen confirmed the diagnosis. Outcomes were favorable in the mother and baby. The diagnosis and treatment of XGP during pregnancy are discussed.

[Neuroradiologic emergencies in infectious pathology]

The main goal of urgent imaging evaluation of patients with suspected CNS infection is to differentiate infectious from tumoral or vascular lesions in order to provide appropriate management. MR imaging, including diffusion weighted imaging and spectroscopy, is superior to CT imaging to characterize lesion location and etiology. The CT and MRI features of the more frequent bacterial, viral and parasitic CNS infections will be described.

[Sinusoidal abnormalities of the liver: MR imaging features]

This article reviews the different MR features found in sinusoidal lesions of the liver parenchyma. The diagnosis of these abnormalities is mainly based on the pathologic examination. These diagnoses relate to numerous diseases including veno-occlusive disease, Budd-Chiari disease, peliosis, hepato-portal sclerosis, and portal intra-sinusoidal thrombosis. The use of fast multi-slice acquisitions associated with dynamic enhancement of the liver leads to an efficient examination and allows analysis of both the parenchymal and vascular components of the liver.

[Comparison between iopamidol and ioxaglate in digital arteriography of the lower limbs]

This prospective study concerning 100 subtraction angiographies of the lower limbs compared two iodine concentrations of iopamidol (300 and 370 mg l/l) and ioxaglate (320 and 350 mg l/l). More pain and movements disturbed the subtraction with iopamidol 370 in comparison with ionic contrast media (p < 0.005). The quality of the contrast was better with ioxaglate 350 (p = 0.05) than with the others. This one appears to be a good compromise for this type of examination.