Hidetaka Watanabe

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This study was designed to evaluate the therapeutic outcome and early postoperative complications, especially pancreatitis, of endoscopic papillary balloon dilation (EPBD) and endoscopic sphincterotomy (EST) in patients with common bile duct stones in our department. One hundred eighty patients with common bile duct stones were randomized to undergo EPBD or(More)
AIM Endoscopic submucosal dissection (ESD) has been positively applied to and gradually standardized for early gastric cancer; however, it is not widely used in the colorectum because of its technical difficulty. METHODS To increase the safety and ease of carrying out colon ESD, we developed a new scissors-type device that we call the stag beetle knife(More)
AIM To assess the diagnostic ability of endoscopic ultrasonography (EUS) for evaluating causes of distal biliary strictures shown on endoscopic retrograde cholangiopancreatography (ERCP) or magnetic resonance cholangiopancreatography (MRCP), even without identifiable mass on computed tomography (CT). METHODS The diagnostic ability of EUS was(More)
We performed a randomized prospective trial to compare unsedated endoscopy via transnasal and transoral routes using a small-caliber endoscope. Two hundred patients referred for diagnostic esophagogastroduodenoscopy (EGD) were randomly allocated to two groups: those undergoing transnasal (TN) and transoral (TO) endoscopy. We examined the insertion rate,(More)
BACKGROUND/AIMS Use of endoscopic papillary balloon dilation (EPBD) for the treatment of common bile duct stones has increased in recent years, owing to its simplicity and its advantage of preserving sphincter function. It has been reported that EPBD is associated with a lower risk of bleeding, but a higher risk of pancreatitis than endoscopic(More)
Narrow band imaging (NBI) magnification analysis has entered use in clinical settings to diagnose colorectal tumors. Pit pattern analysis with magnifying endoscopy is already widely used to assess colorectal lesions and invasion depth. Our study compared diagnoses by vascular pattern analysis and pit pattern analysis with NBI magnification. We examined 296(More)
Using high-performance liquid chromatography combined with a column of immobilized 3 alpha-hydroxysteroid dehydrogenase, 15 bile acids, i.e., cholate, chenodeoxycholate, deoxycholate, lithocholate, ursodeoxycholate, and their five taurine conjugates and five glycine conjugates, were clearly separated and quantified in 38 patients with various hepatobiliary(More)
An 83-year old Japanese man was transferred to our hospital due to a 1-week history of melena and signs of disordered awareness. Esophagogastroduodenoscopy showed a villous tumor associated with massive white mucous discharge in the posterior wall of the gastric corpus, where pathologically identified mucin-producing epithelium with nuclear atypia had(More)
BACKGROUND/AIMS ESD is a new diagnostic and treatment technique for early gastric cancer. This study aimed to evaluate the therapeutic effects observed at our department. METHODOLOGY The subject group included 95 patients with 100 early-stage gastric cancers. According to the Gastric Cancer Treatment Guidelines published by the Japanease Gastric Cancer(More)
A 62-year-old Japanese woman was admitted to our hospital with dyspnea. Chest X-ray revealed massive pleural effusion on the left side. Contrast-enhanced ultrasonography using Levovist was performed to confirm the transdiaphragmatic passage of ascitic fluid into the pleural cavity. After injection of Levovist into the peritoneal cavity, an enhanced(More)
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