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Shawn Mallery

Yukako Nemoto, Rajeev Attam, Mustafa A Arain, Guru Trikudanathan, Shawn Mallery, Gregory J Beilman, Martin L Freeman
OBJECTIVES: The minimally invasive step-up approach for treatment of walled off necrosis (WON) involves drainage followed by later necrosectomy as needed, and is superior to primary surgical necrosectomy. Reported series of endoscopic transluminal necrosectomy include highly selected patients. We report outcomes of a large series of patients with WON managed by an algorithm based on an endoscopically centered step-up approach. METHODS: Consecutive patients with necrotizing pancreatitis from 2009 to 2014, with intervention only for infected or persistently symptomatic WON...
September 2017: Pancreatology: Official Journal of the International Association of Pancreatology (IAP) ... [et Al.]
Guru Trikudanathan, Sophia Smith, J Shawn Mallery
No abstract text is available yet for this article.
March 2018: Clinical Gastroenterology and Hepatology
Miroslav Sekulic, Khalid Amin, Tetyana Mettler, Lizette K Miller, Shawn Mallery, Jimmie Stewart
BACKGROUND: Pancreatic tumors often represent primary neoplasms, however organ involvement with metastatic disease can occur. The use of endoscopic ultrasound-guided fine needle aspiration (EUS-FNA) to determine the underlying pathology provides guidance of clinical management. METHODS: 25 cases were identified in a retrospective review of our institution's records from 2006 to 2016. Clinical parameters and prognosis are described. RESULTS: Metastatic lesions to the pancreas diagnosed by EUS-FNA accounted for 4...
May 2017: Diagnostic Cytopathology
Guru Trikudanathan, Satish Munigala, Usman Barlass, Ahmad Malli, Yusheng Han, Miroslav Sekulic, Melena Bellin, Srinath Chinnakotla, Ty Dunn, Timothy Pruett, Gregory Beilman, Jose-Vega Peralta, Mustafa Arain, Stuart Amateau, Shawn Mallery, Martin L Freeman, Rajeev Attam
BACKGROUND: Rosemont classification for chronic pancreatitis has not been evaluated specifically in non-calcific chronic pancreatitis (NCCP) patients and to this date, it has not been correlated with the gold standard namely histopathology. OBJECTIVE: To assess the correlation of EUS Rosemont criteria for NCCP with histopathology from surgical specimens and evaluate the impact of age, sex, BMI, smoking and alcohol on Rosemont classification. METHODS: Adult patients undergoing TPIAT for NCCP between July 2009 and January 2013 were identified from our institutional database...
January 2017: Pancreatology: Official Journal of the International Association of Pancreatology (IAP) ... [et Al.]
Saleh Elwir, Beenu Thakral, Brooke Glessing, Elizabeth Courville, Shawn Mallery
No abstract text is available yet for this article.
August 2016: ACG Case Reports Journal
Guru Trikudanathan, Shawn J Mallery, Stuart K Amateau
Surgical resection is considered the standard of care in the management of symptomatic insulinoma. In this video, we describe the successful management of a symptomatic insulinoma by using linear array endoscopic ultrasound (EUS)-guided ethanol ablation in a poor surgical candidate. EUS-guided ethanol ablation of insulinoma offers a safer, effective, and less invasive alternative to surgery.
July 2016: Clinical Endoscopy
Guru Trikudanathan, Jose Vega-Peralta, Ahmad Malli, Satish Munigala, Yusheng Han, Melena Bellin, Usman Barlass, Srinath Chinnakotla, Ty Dunn, Timothy Pruett, Gregory Beilman, Mustafa Arain, Stuart K Amateau, Shawn Mallery, Martin L Freeman, Rajeev Attam
OBJECTIVES: Studies correlating endoscopic ultrasound (EUS) with histopathology for chronic pancreatitis (CP) are limited by small sample size, and/or inclusion of many patients without CP, limiting applicability to patients with painful CP. The aim of this study was to assess correlation of standard EUS features for CP with surgical histopathology in a large cohort of patients with non-calcific CP (NCCP). METHODS: Adult patients undergoing total pancreatectomy and islet autotransplantation (TPIAT) for NCCP, between 2008 and 2013, with EUS <1 year before surgery...
April 2016: American Journal of Gastroenterology
Guru Trikudanathan, Sidney P Walker, Satish Munigala, Ben Spilseth, Ahmad Malli, Yusheng Han, Melena Bellin, Srinath Chinnakotla, Ty Dunn, Timothy L Pruett, Gregory J Beilman, Jose Vega Peralta, Mustafa A Arain, Stuart K Amateau, Sarah J Schwarzenberg, Shawn Mallery, Rajeev Attam, Martin L Freeman
OBJECTIVES: Diagnosis of non-calcific chronic pancreatitis (NCCP) in patients presenting with chronic abdominal pain is challenging and controversial. Contrast-enhanced magnetic resonance imaging (MRI) with secretin-stimulated MRCP (sMRCP) offers a safe and noninvasive modality to diagnose mild CP, but its findings have not been correlated with histopathology. We aimed to assess the correlation of a spectrum of MRI/sMRCP findings with surgical histopathology in a cohort of NCCP patients undergoing total pancreatectomy with islet autotransplantation (TPIAT)...
November 2015: American Journal of Gastroenterology
Srinath Chinnakotla, Gregory J Beilman, Ty B Dunn, Melena D Bellin, Martin L Freeman, David M Radosevich, Mustafa Arain, Stuart K Amateau, J Shawn Mallery, Sarah J Schwarzenberg, Alfred Clavel, Joshua Wilhelm, R Paul Robertson, Louise Berry, Marie Cook, Bernhard J Hering, David E R Sutherland, Timothy L Pruett
OBJECTIVE: Our objective was to analyze factors predicting outcomes after a total pancreatectomy and islet autotransplantation (TP-IAT). BACKGROUND: Chronic pancreatitis (CP) is increasingly treated by a TP-IAT. Postoperative outcomes are generally favorable, but a minority of patients fare poorly. METHODS: In our single-centered study, we analyzed the records of 581 patients with CP who underwent a TP-IAT. Endpoints included persistent postoperative "pancreatic pain" similar to preoperative levels, narcotic use for any reason, and islet graft failure at 1 year...
October 2015: Annals of Surgery
Saleh Elwir, Brooke Glessing, Khalid Amin, Eric Jensen, Shawn Mallery
Inflammation in ectopic pancreatic tissue can clinically present with pain or obstructive symptoms, depending on the location of the ectopic tissue. We present a rare case of gastric outlet obstruction secondary to pancreatitis of ectopic pancreatic tissue in the pylorus.
August 2017: Gastroenterology Report
Brooke R Glessing, Shawn Mallery, Martin L Freeman, Madeline D Newcomb, Mustafa A Arain
No abstract text is available yet for this article.
April 2015: Gastrointestinal Endoscopy
Guru Trikudanathan, Rajeev Attam, Mustafa A Arain, Shawn Mallery, Martin L Freeman
Interventions for necrotizing pancreatitis have undergone a paradigm shift away from open surgical necrosectomy and toward minimally invasive techniques, with endoscopic transmural drainage (ETD) and necrosectomy emerging as principle forms of treatment. Recent multicenter studies, randomized trials, evidence-based guidelines, and consensus statements have endorsed the safety and efficacy of endoscopic and other minimally invasive techniques for the treatment of walled-off necrosis. A comprehensive review of indications, standard and novel approaches, outcomes, complications, and controversies regarding ETD and necrosectomy is presented...
July 2014: American Journal of Gastroenterology
Guru Trikudanathan, Mustafa Arain, Shawn Mallery, Martin Freeman, Rajeev Attam
Acute pancreatitis in children is rarely complicated by the development of necrosis. Although endoscopic transluminal necrosectomy is evolving as the standard of care in adults, its feasibility in the pediatric population has not been established. We hereby report the first case series of children with necrotizing pancreatitis successfully treated with endoscopic therapy. We believe the use of fully covered self-expanding metallic stents in the cystgastrostomy may reduce the number of transluminal necrosectomy sessions for large necrotic collections in children...
August 2014: Journal of Pediatric Gastroenterology and Nutrition
Rajeev Attam, Guru Trikudanathan, Mustafa Arain, Yukako Nemoto, Brooke Glessing, Shawn Mallery, Martin L Freeman
BACKGROUND: Interventions for necrotizing pancreatitis have undergone a recent paradigm shift toward minimally invasive techniques, including endoscopic transluminal necrosectomy (ETN). The optimal stent for endoscopic transmural drainage remains unsettled. OBJECTIVE: To evaluate a novel large-bore, fully covered metal through-the-scope (TTS) esophageal stent for cystenterostomy in large walled-off necrosis (WON). DESIGN: Retrospective case series...
August 2014: Gastrointestinal Endoscopy
Manuel Berzosa, Scott F Davies, Kapil Gupta, Steven M Debol, Rebecca Li, David Miranda, Shawn Mallery
BACKGROUND: The knowledge of bedside diagnostic EUS in critically ill patients is limited. OBJECTIVE: To investigate the indications, feasibility, safety, and clinical utility of diagnostic EUS in the intensive care unit (ICU). DESIGN: Retrospective. SETTING: Tertiary-care referral teaching hospital. PATIENTS: All consecutive patients who had EUS done in the ICU within a 6-year period. INTERVENTION: Bedside EUS and EUS-guided FNA...
February 2013: Gastrointestinal Endoscopy
Ning Zhong, Lizhi Zhang, Naoki Takahashi, Vladislav Shalmiyev, Marcia Irene Canto, Jonathan E Clain, John C Deutsch, John DeWitt, Mohamad A Eloubeidi, Ferga C Gleeson, Michael J Levy, Shawn Mallery, Massimo Raimondo, Elizabeth Rajan, Tyler Stevens, Mark Topazian
BACKGROUND & AIMS: Mural nodules predict malignancy within pancreatic cysts, but it is not clear whether endoscopic ultrasound (EUS) and computed tomography (CT) accurately identify nodules. We assessed images and the histology of mural nodules in branch duct intraductal papillary mucinous neoplasms (BD-IPMNs) and mucinous cystic neoplasms (MCNs) and identified criteria to distinguish mural nodules from mucus. METHODS: We reviewed pathology specimens and EUS and CT images from consecutive patients with resected BD-IPMNs or MCNs...
February 2012: Clinical Gastroenterology and Hepatology
Mark A Virtue, Shawn Mallery, Rebecca Li, Timothy D Sielaff
CONTEXT: Appropriate surgical exploration and resection of pancreatic carcinoma depends on accurate preoperative evaluation. OBJECTIVE: Determine the accuracy of endoscopic ultrasound in predicting the need for surgical exploration in patients with solid pancreatic masses deemed by computer tomography to be resectable without venous grafting (absence of distant metastatic disease or major vascular involvement). PATIENTS: All patients between March 2000 and November 2003 with focal pancreatic mass lesions deemed to be surgically resectable by computer tomography...
March 8, 2008: JOP: Journal of the Pancreas
Edward B Stelow, Faris M Murad, Steven M Debol, Michael W Stanley, Ricardo H Bardales, Rebecca Lai, Shawn Mallery
We studied the use of immunocytochemical analysis with material procured by endoscopic ultrasound-guided fine-needle aspiration (EUS-guided FNA) for the diagnosis of subepithelial intramural gastrointestinal (GI) mesenchymal neoplasms (SIGIMNs). We identified all EUS-guided FNA specimens of SIGIMNs that had undergone immunocytochemical analysis. Results were compared with follow-up histologic diagnoses. There were 95 aspirates that were diagnosed as GI mesenchymal tumors (GI stromal tumors [GISTs], n = 46), leiomyomas (n = 38), peripheral nerve sheath tumors (n = 5), and other neoplasms by cytologic examination...
February 2008: American Journal of Clinical Pathology
Edward B Stelow, Vanessa M Shami, Todd E Abbott, Michelle Kahaleh, Reid B Adams, Todd W Bauer, Steven M Debol, James M Abraham, Shawn Mallery, Maria Luisa Policarpio-Nicolas
Cytology frequently has some role in preoperatively distinguishing pancreatic mucus-producing neoplasia (intraductal papillary mucinous neoplasms [IPMNs] and mucinous cystic neoplasms [MCNs]) from other pancreatic cysts. We evaluated all cytologic specimens at our institutions from resected pancreatic cystic lesions for lesional extracellular and cellular material. Lesional extracellular material was identified in 32 of 38 of the cytologic samples from cystic pancreatic mucus-producing neoplasms (28 of 31 IPMNs and 4 of 7 MCNs)...
January 2008: American Journal of Clinical Pathology
Kapil Gupta, Shawn Mallery
BACKGROUND: EUS-guided tissue acquisition is a valuable technique. Obstructing lesions of the oropharynx or esophagus may preclude passage of a standard echoendoscope. In the past this has prevented EUS-guided tissue sampling. The recently introduced small-caliber ultrasonic bronchovideoscope (developed for endobronchial ultrasound) may allow EUS-guided FNA in this setting. OBJECTIVE: Our purpose was to assess the possible use of the ultrasonic bronchovideoscope to perform upper GI EUS in patients where passage of standard EUS scope was unsuccessful...
September 2007: Gastrointestinal Endoscopy
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