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Agarwal L, Varshney VK, Jabbar S, Selvakumar B, Yadav T, Khera S. Thoracoscopy-Assisted Esophagectomy for Esophageal Leiomyomatosis. J Gastrointest Cancer 2024; 55:193-197. [PMID: 37803192 DOI: 10.1007/s12029-023-00974-9] [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] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/23/2023] [Indexed: 10/08/2023]
Abstract
INTRODUCTION Diffuse esophageal leiomyomatosis is a rare esophageal tumor characterized by circumferential thickening of smooth muscle layers of the entire esophagus. CLINICAL CASE: Herein, we describe the case of a 19-year-old girl, who presented with a history of long-standing dysphagia. On evaluation she was found to have diffuse esophageal leiomyomatosis and was managed successfully by thoracoscopy-assisted esophagectomy with intra-nodal indocyanine green injection. DISCUSSION In this report, we discuss the pre-operative workup and our surgical approach to managing this rare entity. We also discuss the available literature on the subject and the lessons learnt in managing this complex condition.
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Affiliation(s)
- Lokesh Agarwal
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Basni Industrial Area, Phase-II, 342005, Jodhpur, Rajasthan, India
| | - Vaibhav Kumar Varshney
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Basni Industrial Area, Phase-II, 342005, Jodhpur, Rajasthan, India.
| | - Shabana Jabbar
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Basni Industrial Area, Phase-II, 342005, Jodhpur, Rajasthan, India
| | - B Selvakumar
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Basni Industrial Area, Phase-II, 342005, Jodhpur, Rajasthan, India
| | - Taruna Yadav
- Department of Radiodiagnosis, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Sudeep Khera
- Department of Pathology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
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Jabbar SA, Selvakumar B, Soni SC, Taywade S, Elhence P. Synchronous Squamous Cell Carcinoma of Rectum and Anal Canal Detected by FDG PET/CT-A Rare Entity. Clin Nucl Med 2023; 48:e297-e299. [PMID: 37019123 DOI: 10.1097/rlu.0000000000004625] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
Abstract
ABSTRACT Squamous cell carcinoma is the most common malignancy of the anal canal, and FDG PET/CT is recommended in its nodal staging, radiotherapy planning, and response assessment. We share an interesting case of dual primary malignancy of the anal canal and rectum, which was detected by 18 F-FDG PET/CT and confirmed on histopathology as synchronous squamous cell carcinoma.
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Affiliation(s)
| | - B Selvakumar
- From the Departments of Surgical Gastroenterology
| | | | | | - Poonam Elhence
- Pathology and Lab Medicine, All India Institute of Medical Sciences, Jodhpur, India
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Varshney VK, Hussain S, Vignesh N, Selvakumar B, Agarwal L, Yadav T. Duplicated extrahepatic bile duct (type Vb): An important rare anomaly. Ann Hepatobiliary Pancreat Surg 2023; 27:220-225. [PMID: 36882984 DOI: 10.14701/ahbps.22-118] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 01/03/2023] [Accepted: 01/16/2023] [Indexed: 03/09/2023] Open
Abstract
Congenital duplication of the extrahepatic bile duct (DEBD) is an unusual anomaly of the biliary system. It occurs due to inability of the embryological duplex biliary system to regress. DEBD has various subtypes depending on the morphology and opening of the aberrant common bile duct. It can have distinct complications. We encountered a 38-year-old lady who experienced pain in the right upper abdomen along with a low-grade fever. Magnetic resonance cholangiopancreatography revealed DEBD with multiple calculi in the right hepatic duct (ductolithiasis) and joining of the right hepatic duct with the left hepatic duct in the intrapancreatic region. Endoscopic retrograde cholangiography failed to clear the calculi from the right duct. They were then managed by common bile duct exploration and roux-en-Y right hepaticojejunostomy for biliary drainage. Her postoperative period was uneventful. She is currently doing well after three months of follow-up. Hence, a proper preoperative delineation of such rare anomalies is essential. It could avoid inadvertent injury to the bile duct and operative complications.
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Affiliation(s)
- Vaibhav Kumar Varshney
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Sabir Hussain
- Department of Gastroenterology, Dr. S N Medical College, Jodhpur, Rajasthan, India
| | - N Vignesh
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - B Selvakumar
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Lokesh Agarwal
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Taruna Yadav
- Department of Radiodiagnosis, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
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Natesan V, Selvakumar B, Varshney VK, Soni S, Varshney P, Agarwal L. Laparoscopic right hemicolectomy with complete mesocolic excision-central vascular ligation for right colon cancer in a rare superior mesenteric vein variant anatomy - a video vignette. Colorectal Dis 2023. [PMID: 36779281 DOI: 10.1111/codi.16519] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 12/05/2022] [Accepted: 12/06/2022] [Indexed: 02/14/2023]
Affiliation(s)
- Vignesh Natesan
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - B Selvakumar
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Vaibhav Kumar Varshney
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Subhash Soni
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Peeyush Varshney
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Lokesh Agarwal
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
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Jabbar SA, Varshney VK, Selvakumar B, Soni S, Varshney P, Agarwal L. Robotic total proctocolectomy with ileal pouch-anal anastomosis using indocyanine green fluorescence imaging in a case of medically refractory ulcerative colitis-a video correspondence. Colorectal Dis 2023. [PMID: 36744650 DOI: 10.1111/codi.16507] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/24/2022] [Accepted: 01/02/2023] [Indexed: 02/07/2023]
Affiliation(s)
- Shabana Abdul Jabbar
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Vaibhav Kumar Varshney
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - B Selvakumar
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Subhash Soni
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Peeyush Varshney
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Lokesh Agarwal
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
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Kaviya P, Chitra P, Selvakumar B. A Unified Framework for Monitoring Social Distancing and Face Mask Wearing Using Deep Learning: An Approach to Reduce COVID-19 Risk. Procedia Comput Sci 2023; 218:1561-1570. [PMID: 36743798 PMCID: PMC9886329 DOI: 10.1016/j.procs.2023.01.134] [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] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Corona Virus Disease 2019 (COVID-19) is caused by Severe Acute Syndrome Corona Virus 2 (SARS-COV-2). It has become a pandemic disease of the 21st century, killing many lives. During this pandemic situation, precautious measures like social distancing and wearing face mask are being followed globally to break the COVID chain. A pre-programmed viewing system is needed to monitor whether these COVID-19 appropriate behaviours are being followed by the commoners and to ensure COVID-19 preventive measures are followed appropriately. In this work, a deep learning based predictive model and live risk analysis application has been proposed, which detects the high-risk prone areas based on social distancing measures among individuals and face mask wearing tendency of the commoners. The proposed system utilizes ImageNet-1000 dataset for human detection using You Only Look Once (YOLOv3) object detection algorithm; Residual Neural Network (ResNet50v2) uses Kaggle dataset and Real-World Masked Face Dataset (RMFD) for detecting if the persons are face masked or not. Detected human beings (in side-view) are transformed to top view using Top-View Transform Model (TVTM) followed by the calculation of interpersonal distance between the pedestrians and categorized them into three classes include high risk, medium risk, low risk. This unified predictive model provided an accuracy of 97.66%, precision of 97.84%, and F1-Score of 97.92%.
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Affiliation(s)
- P Kaviya
- Kamaraj College of Engineering and Technology, Vellakulam and 625701, Tamilnadu, India
| | - P Chitra
- Thiagarajar College of Engineering, Madurai and 625015, Tamilnadu, India
| | - B Selvakumar
- Mepco Schlenk Engineering College, Sivakasi and 626005, Tamilnadu India
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Muacevic A, Adler JR, Varshney P, Varshney VK, Selvakumar B. Post-Esophagectomy Hiatal Hernia: A Case Series. Cureus 2023; 15:e33214. [PMID: 36733577 PMCID: PMC9887932 DOI: 10.7759/cureus.33214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/31/2022] [Indexed: 01/02/2023] Open
Abstract
Post-esophagectomy hiatal hernia is a rare complication having varied presentation from asymptomatic cases detected incidentally on follow-up imaging to acute surgical emergency for strangulation or gangrene. Patients presenting as a surgical emergency have a prolonged post-operative course with significant morbidity. We present three cases of post-esophagectomy hiatal hernia. Two of the three cases were operated for esophageal squamous cell carcinoma (SCC) and one patient was operated for esophageal leiomyomatosis. Two of the three cases (SCC and esophageal leiomyomatosis) underwent minimally invasive Mckeown's esophagectomy and one case underwent robotic transthoracic Ivor-Lewis esophagectomy. All cases underwent contrast enhanced CT (CECT) and were biopsy proven prior to their index surgery. Both cases of SCC had prior neoadjuvant chemoradiation followed by surgery while esophageal leiomyomatosis underwent upfront surgery. All three cases have improved symptomatically and are doing well on follow up (case 1 - 12 months, cases 2 and 3 - 3 months). All three of our cases have different clinical presentation in terms of symptoms, severity, and time duration from index surgery. Two of the three cases underwent emergency surgery and one case which was asymptomatic detected incidentally on surveillance imaging and was managed conservatively. Post-esophagectomy hiatal hernia is a rare entity with varying presentation. The management options in such cases vary depending on the severity of symptoms and time after index surgery. In cases presenting as surgical emergency, successful management depends on prompt detection, early surgery, proper post-operative care, and rehabilitation.
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Jain V, Selvakumar B, Varshney VK, Vishwajeet V, Taywade S, Agarwal L, Yadav T, Pandey R. Gangliocytic Paraganglioma of the Duodenum: A Masquerader. Ochsner J 2023; 23:251-256. [PMID: 37711472 PMCID: PMC10498948 DOI: 10.31486/toj.23.0010] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/16/2023] Open
Abstract
Background: Gangliocytic paraganglioma (GP) is a rare tumor that most commonly arises from the duodenum and is characterized pathologically by 3 cell types: epithelioid, spindle, and ganglion cells. GP is often difficult to differentiate from a neuroendocrine tumor on the basis of preoperative imaging, and the diagnosis is based on final histopathologic and immunohistochemical analysis. Case Report: We report the case of a 28-year-old male who presented with pain in the abdomen, bilious vomiting, and weight loss. Imaging showed a mass involving the first and second part of the duodenum that was likely a neuroendocrine or gastrointestinal stromal tumor. He underwent robotic-assisted pancreatoduodenectomy, and the final pathology report identified GP with lymph node metastasis. The patient was doing well at 1-year follow-up. Conclusion: GP is often a histologic surprise as most cases are diagnosed in postoperative histopathology. While GP has a more benign course than a neuroendocrine tumor, radical surgical resection is warranted in cases of diagnostic dilemma, suspicion of malignancy, or lymph node metastasis. Robotic-assisted pancreatoduodenectomy is a feasible option.
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Affiliation(s)
- Vishu Jain
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - B Selvakumar
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Vaibhav Kumar Varshney
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Vikarn Vishwajeet
- Department of Pathology and Laboratory Medicine, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Sameer Taywade
- Department of Nuclear Medicine, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Lokesh Agarwal
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Taruna Yadav
- Department of Radiodiagnosis, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Rakesh Pandey
- Department of Nuclear Medicine, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
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Jain V, Varshney P, Aggarwal D, Soni SC, Varshney VK, Selvakumar B, Agarwal L. Carcinosarcoma of the Esophagus-A Diagnostic Challenge. Ochsner J 2023; 23:243-247. [PMID: 37711471 PMCID: PMC10498951 DOI: 10.31486/toj.23.0007] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/16/2023] Open
Abstract
Background: Esophageal carcinosarcoma is an uncommon histologic variant of esophageal malignancy, occurring in approximately 0.5% to 2.8% of patients. Esophageal carcinosarcoma usually involves the middle and lower esophagus and consists of both epithelial and mesenchymal components. Case Report: A 54-year-old male presented with painless progressive dysphagia associated with loss of weight for 2 months. Esophagogastroduodenoscopy suggested an ulceroproliferative polypoidal growth in the lower thoracic esophagus. Biopsies from the growth showed leiomyosarcoma with tumor cells immunopositive for vimentin, h-Caldesmon, and smooth muscle actin and negative for pan-cytokeratin. Imaging suggested a heterogeneously enhancing polypoidal growth arising in the lower third of the esophagus. Thoracoscopic-assisted McKeown esophagectomy with gastric pull-up and standard 2-field lymphadenectomy was performed. A minor epithelial component was identified on final pathologic examination in addition to the leiomyosarcoma found on the preoperative biopsy. This epithelial component was invasive squamous cell carcinoma and was positive for pan-cytokeratin and p40, both of which were negative in the sarcomatous component. The patient received 4 cycles of adjuvant chemotherapy (carboplatin and paclitaxel). However, he developed a recurrence in the left cervical lymph node 4 months after adjuvant treatment and died 2 months after the diagnosis of recurrence. Conclusion: Carcinosarcoma can be easily missed in the presence of predominantly sarcomatous components even on immunohistochemical analysis. These tumors may be associated with poor prognosis and may have early recurrence despite surgery and adjuvant treatment.
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Affiliation(s)
- Vishu Jain
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Peeyush Varshney
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Divya Aggarwal
- Department of Pathology and Laboratory Medicine, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Subhash Chandra Soni
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Vaibhav Kumar Varshney
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - B Selvakumar
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | - Lokesh Agarwal
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
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Varshney VK, Nayar R, Hussain S, Selvakumar B. Total robotic lateral pancreaticojejunostomy and modified Frey's procedure for chronic calcific pancreatitis. Langenbecks Arch Surg 2022; 408:1. [PMID: 36576590 DOI: 10.1007/s00423-022-02735-x] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 10/15/2022] [Indexed: 12/29/2022]
Abstract
BACKGROUND Surgical intervention has been shown to have good post-operative outcomes in patients with chronic pancreatitis with pain refractory to oral analgesics. We present our initial experience with robotic lateral pancreaticojejunostomy (LPJ) and modified Frey's procedure (MFP). METHODOLOGY Patients with chronic calcific pancreatitis were evaluated with routine biochemical and radiological investigations. The indication of surgery was intractable pain which was recorded by an Intensity Frequency, Consequence (IFC) pain score. The patient was placed in a reverse Trendelenburg position with four 8-mm robotic ports and one 12-mm assistant port. Robotic ultrasound was utilized to identify the pancreatic duct. After retrieving all the calculi, which was confirmed by pancreatoscopy with the help of a video choledochoscope and performing the head coring in particular cases, the Roux-en-Y LPJ was performed. RESULTS Among five patients (4 males, one female), robotic LPJ was performed in 2 and MFP in 3 patients. The cohort's median age was 32 (interquartile range (IQR), 28, 40) years, and the median (IQR) pancreatic duct size was 9 (9, 13) mm. The median (IQR) duration of the procedure was 385 (380, 405) minutes, with a median (IQR) blood loss of 100 (50-100) ml, and the patients were discharged on median post-operative day 5. The patients continue to do well at a median follow-up of 3-30 months without the requirement of oral analgesics. CONCLUSION Robotic LPJ and MFP are feasible in experienced hands with good post-operative outcomes and enhanced quality of life. Intra-operative pancreatoscopy with the help of a choledochoscope can be utilized to ascertain the complete clearance of pancreatic duct stones and the consequent pain relief.
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Affiliation(s)
- Vaibhav Kumar Varshney
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Basni Industrial Area, Phase-II, Jodhpur, 342005, Rajasthan, India.
| | - Raghav Nayar
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Basni Industrial Area, Phase-II, Jodhpur, 342005, Rajasthan, India
| | - Sabir Hussain
- Department of Medical Gastroenterology, Dr. S. N. Medical College, Jodhpur, Rajasthan, India
| | - B Selvakumar
- Department of Surgical Gastroenterology, All India Institute of Medical Sciences, Basni Industrial Area, Phase-II, Jodhpur, 342005, Rajasthan, India
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Varshney VK, Hussain S, Selvakumar B, Vignesh N, Sureka B. Mirizzi Syndrome With Bouveret Syndrome: A Rare Amalgam. Cureus 2022; 14:e24187. [PMID: 35592212 PMCID: PMC9110074 DOI: 10.7759/cureus.24187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/16/2022] [Indexed: 11/05/2022] Open
Abstract
Mirizzi and Bouveret syndromes are uncommon but important complications of calculous cholecystitis. Mirizzi syndrome commonly presents with jaundice due to extrinsic compression on the common bile duct by an impacted stone at the gall bladder infundibulum, whereas Bouveret syndrome presents with gastric outlet obstruction due to a large stone in the duodenum. Our case is a 65-year-old lady who presented with pain in the right upper abdomen associated with nausea and vomiting. Contrast-enhanced computed tomography and MRI of the abdomen were suggestive of calculus in the infundibulum of the gall bladder with compression over the common bile duct and a large stone in the first part of the duodenum. Upper gastrointestinal endoscopy confirmed the findings but could not retrieve the stone. Cholecystectomy with the retrieval of calculus from the infundibulum and duodenum was performed with the closure of the fistulous opening. The patient did well in the post-operative period and is doing well after nine months of follow-up. Chronic calculus cholecystitis can present in varied forms, and one should be aware of such rare complications and their management.
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Varshney VK, Swami A, Nayar R, Selvakumar B. Robotic CDC excision with hepaticojejunostomy with the application of indocyanine green fluorescence. Int J Surg 2022. [DOI: 10.1016/j.ijsu.2022.106343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Mahalakshmi G, Selvakumar B, Vennila KN, Rao PL, Madhuri S, Seenivasaperumal M, Elango KP. Spectroscopic Studies on the Interaction of Naphthyridines with DNA and Fluorescent Detection of DNA in Agarose Gel. J Fluoresc 2021; 31:327-338. [PMID: 33389419 DOI: 10.1007/s10895-020-02658-0] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 12/03/2020] [Indexed: 11/25/2022]
Abstract
Four new naphthyridine derivatives (R1-R4) possessing amino acid or boronic acid moieties have been synthesized and characterized using 1H and 13C NMR, FT-IR, and mass spectral techniques. The mechanism of binding of these probes with calf thymus DNA (CT-DNA) has been delineated through UV-Vis, fluorescence, and circular dichroism (CD) spectral techniques along with thermodynamic and molecular docking studies. Small hypochromicity in absorption maximum of the probes without any shift in wavelength of absorption suggests groove binding mode of interaction of these probes with CT-DNA, confirmed by CD and 1H NMR spectral data competitive binding assay with ethidium bromide (EB). CT-DNA quenches the fluorescence of these probes via a static quenching mechanism. In the case of R1 and R4, the observed ΔHo < 0 and ΔSo > 0suggest that these probes interact with CT-DNA through H-bonding and hydrophobic interactions, while in the interaction of R2 and R3, van der Walls and H-boding forces are found to be dominant (ΔHo < 0 and ΔSo < 0). Results of molecular docking investigations corroborate well with that of spectral studies, and these probes bind in the minor groove of DNA. These probes are found to be effective fluorescent staining agents for DNA in agarose gel in gel electrophoresis experiment with sensitivity comparable to that of EB, and DNA amounts as low as 37.5 ng are visually detectable in the gel.
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Affiliation(s)
- G Mahalakshmi
- Department of Chemistry, Gandhigram Rural Institute, Deemed to be University, Gandhigram, 624 302, India
| | - B Selvakumar
- Anthem Biosciences Pvt. Ltd., Bangalore, 560 099, India
| | - K N Vennila
- Department of Chemistry, Gandhigram Rural Institute, Deemed to be University, Gandhigram, 624 302, India
| | - P Lakshmana Rao
- National Institute of Animal Biotechnology, Hyderabad, 500 049, India
| | - S Madhuri
- National Institute of Animal Biotechnology, Hyderabad, 500 049, India
| | - M Seenivasaperumal
- Department of Chemistry, Gandhigram Rural Institute, Deemed to be University, Gandhigram, 624 302, India
| | - Kuppanagounder P Elango
- Department of Chemistry, Gandhigram Rural Institute, Deemed to be University, Gandhigram, 624 302, India.
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Mahalakshmi G, Vennila KN, Selvakumar B, Rao PL, Malwade R, Deval S, Madhuri S, Seenivasaperumal M, Elango KP. Spectroscopic investigations on DNA binding profile of two new naphthyridine carboxamides and their application as turn-on fluorescent DNA staining probes. J Biomol Struct Dyn 2019; 38:3443-3451. [PMID: 31422749 DOI: 10.1080/07391102.2019.1657501] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Two new 10-methoxydibenzo[b,h][1,6]naphthyridine-2-carboxamide derivatives (R1 and R2) have been synthesized and characterized using different spectral techniques. The binding of these probes with DNA was investigated using spectral (Electronic, fluorescence, 1H NMR and circular dichroism) and molecular docking studies. These probes exhibited a strong fluorescence around 440 nm upon excitation around 380 nm. Electronic and competitive fluorescence titration studies, in HEPES [(4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid)] buffer/dimethyl sulfoxide (pH 7.4) medium, suggest that these probes bind strongly to DNA, which is substantiated by 1H NMR study. The binding constants are calculated to be 5.3 × 107 and 6.8 × 106 M-1 for R1 and R2, respectively. From the results of spectral studies, it is proposed that the mechanism of binding of these probes with DNA is through minor groove binding mode, which is further confirmed by circular dichroism and molecular docking studies. Initial cell viability screening using MTT (3-[4,5-methylthiazol-2-yl]-2,5-diphenyl-tetrazolium bromide) assay shows that normal Vero cells are viable towards these probes at nano molar concentration, which is the concentration range employed in the present study for DNA staining (IC50 in the order of 0.023 mM). The enhancement in fluorescence intensity of these probes upon binding with DNA enables the staining of DNA in agarose gel in gel electrophoresis experiment. The sensitivity of these probes is comparable with that of ethidium bromide and DNA amounts as low as 4 nano gram are detectable.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- G Mahalakshmi
- Department of Chemistry, Gandhigram Rural Institute (Deemed to be University), Gandhigram, India
| | - K N Vennila
- Department of Chemistry, Gandhigram Rural Institute (Deemed to be University), Gandhigram, India
| | | | - P Lakshmana Rao
- National Institute of Animal Biotechnology, Hyderabad, India
| | - Ruchi Malwade
- National Institute of Animal Biotechnology, Hyderabad, India
| | - Sunny Deval
- National Institute of Animal Biotechnology, Hyderabad, India
| | - S Madhuri
- National Institute of Animal Biotechnology, Hyderabad, India
| | - M Seenivasaperumal
- Department of Chemistry, Gandhigram Rural Institute (Deemed to be University), Gandhigram, India
| | - Kuppanagounder P Elango
- Department of Chemistry, Gandhigram Rural Institute (Deemed to be University), Gandhigram, India
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Selvakumar B, Wilhelm J, Wolff D, Seeger W, Lohmeyer J, Herold S. Functional phenotype and role of resident and recruited bone marrow derived exudate macrophages in influenza virus-induced lung injury and repair. Int J Infect Dis 2018. [DOI: 10.1016/j.ijid.2018.04.3522] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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16
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Sriramarao P, Selvakumar B, Damodaran C, Rao BS, Prakash O, Rao PV. Immediate hypersensitivity to Parthenium hysterophorus. I. Association of HLA antigens and Parthenium rhinitis. Clin Exp Allergy 1990; 20:555-60. [PMID: 2253087 DOI: 10.1111/j.1365-2222.1990.tb03149.x] [Citation(s) in RCA: 9] [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] [Indexed: 12/31/2022]
Abstract
Lymphocytes collected from rhinitis subjects with strong positive skin reactions to the pollen allergens of Parthenium hysterophorus (American feverfew) having moderate to high titres of Parthenium-specific serum IgE were analysed for association of HLA-antigens covering 13 specificities of HLA-A, 17 specificities of HLA-B and eight specificities of HLA-DR loci by the NIH two-stage microlymphocytotoxicity assay. Comparison of the phenotypic frequencies of HLA-A and B antigens between Parthenium rhinitis subjects (n = 22) and control subjects (n = 137) did not suggest any significant association when tested for these antigen specificities. A significant correlation in the association of HLA-DR3 antigen with a relative risk of 11.33, however, was observed in Parthenium rhinitis subjects (n = 30) when compared to controls (n = 50).
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Affiliation(s)
- P Sriramarao
- Department of Biochemistry, Indian Institute of Science, Bangalore
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