Masanori Kobayashi

A Guidewire Looped‐Back Technique for Endoscopic Retrieval of a Migrated Biliary Stent

Mayu Sassa, Masanori Kobayashi, Takahiro Kawamura

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Technique for Safe Repositioning of Duckbill-Type Laser-Cut Anti-Reflux Metal Stents Using a Biliary Dilatation Balloon

Kozue Uchidate, Masanori Kobayashi, Takahiro Kawamura

Case Presentation An 86-year-old woman with distal cholangiocarcinoma ([ Fig. 1a ]) initially underwent plastic stent placement but developed cholangitis 3 days later. To ensure prolonged patency, a duckbill-type anti-reflux metal stent (D-ARMS; 10 mm, 7 cm; Duckbill Biliary Stent; SB-Kawasumi Laboratories, …

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Nationwide epidemiological survey of acute pancreatitis in Japan, 2021: the impact of the COVID-19 pandemic and revised clinical guidelines

Yuichi Tanaka, Atsushi Masamune, Ryotaro Matsumoto, Tetsuya Takikawa et autres

OBJECTIVES: This study aimed to clarify the current clinico-epidemiological characteristics of acute pancreatitis (AP) in Japan. METHODS: We conducted a two-stage nationwide survey of patients with AP treated at selected hospitals in 2021, during the COVID-19 pandemic. The first stage estimated the …

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Successful Biliary Cannulation Using a Novel Rotatable Sphincterotome in a Patient with Billroth I Reconstruction

Masanori Kobayashi, Takahiro Kawamura

Keywords biliary - cannulation - endoscopic retrograde cholangiopancreatography - sphincterotome Author Contributions M.Y. and M.K. drafted the manuscript and performed endoscopy. T.K. revised the manuscript. All authors have read the final manuscript and approved it. Ethical Statement This report was conducted in …

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Endoscopic transpapillary gallbladder drainage using a novel cholangioscope

Ryosuke Hamamura, Masanori Kobayashi, Ryuichi Okamoto

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Development of an intraductal papillary mucinous neoplasm malignancy prediction scoring system

Masanori Kobayashi, Hiromune Katsuda, Aya Maekawa, Keiichi Akahoshi et autres

Despite the presence of various guidelines, diagnosing malignant intraductal papillary mucinous neoplasm (IPMN) continues to pose challenges. Furthermore, although endoscopic ultrasonography (EUS) offers high-resolution images, it has not yet recognized as the primary tool for malignancy diagnosis. The study objective was to …

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Evaluating endoscopic ultrasound-guided tissue acquisition for diagnosis of small pancreatic neuroendocrine neoplasms

Hiromune Katsuda, Masanori Kobayashi, Go Ito, Ami Kawamoto et autres

Abstract Background and study aims Although small hypervascular tumors are suspected to be pancreatic neuroendocrine tumors (p-NENs), their diagnosis and treatment are challenging. This study evaluated the usefulness of endoscopic ultrasound-guided tissue acquisition (EUS-TA) for diagnosis of small p-NENs. Methods All p-NEN …

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P-wave terminal force is related to left pulmonary vein reconnection in patients with atrial fibrillation recurrence after pulmonary vein isolation

Yasushi Wakabayashi, Hayata Uesako, Masanori Kobayashi, Tomohide Ichikawa et autres

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Gastrointestinal: Rupture of a pancreaticoduodenal artery aneurysm after endoscopic sphincterotomy in a case of median arcuate ligament syndrome

Hiroshige Katsuda, Masanori Kobayashi, Ryuichi Okamoto

A 70-year-old woman underwent endoscopic retrograde cholangiopancreatography due to acute cholangitis caused by bile duct stones. Endoscopic findings showed a large peripapillary diverticulum, with the major papilla located within it (Fig. 1a). After performing an endoscopic sphincterotomy (EST), a plastic stent was …

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Low‐cost and reliable method for confirming residual bile duct stones utilizing a novel peroral cholangioscope

Shun Ishido, Masanori Kobayashi, Ryuichi Okamoto

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Optimization of Endoscopic Ultrasound Characteristics in the Diagnosis of Malignant Intraductal Papillary Mucinous Neoplasm

Masanori Kobayashi, Mao Niimi, Hiromune Katsuda, Keiichi Akahoshi et autres

OBJECTIVES: Endoscopic ultrasound (EUS) is an excellent diagnostic tool that provides high-resolution images of pancreatic cystic lesions. However, its role in the diagnosis of malignant intraductal papillary mucinous neoplasm (IPMN) remains limited and unclear. We aimed to determine the usefulness of this …

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Endoscopic recanalization of an occluded Braun anastomosis using an endoscopic injection needle

Hiromune Katsuda, Masanori Kobayashi, Ryuichi Okamoto

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