Publications by authors named "Takehiro Iwasaki"

Article Synopsis
  • This study investigates the unclear causes of superficial non-ampullary duodenal epithelial tumors (SNADETs) and their relationship with Helicobacter pylori infection and gastric mucosal atrophy.
  • A total of 177 patients with SNADETs were compared to 531 matched controls to analyze the prevalence of H. pylori infection and endoscopic gastric mucosal atrophy.
  • The findings revealed that non-atrophic gastric mucosa was a significant risk factor for SNADETs, indicating a strong association independent of H. pylori infection status.
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We report a case of hemoperitoneum and sepsis from transhepatic gallbladder perforation in an 87-year-old male with acute cholecystitis who had past history of endoscopic sphincterotomy for common bile duct stone. Contrast-enhanced computed tomography (CT) showed intrahepatic and subcapsular low density areas. A wall defect of gallbladder was seen in coronal and sagittal - sections at the liver bed.

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A man in his 60s was hospitalized with multiple cerebral infarctions and referred for Trousseau's syndrome. Computerized tomography confirmed a 60-mm mass in the pancreatic head and swollen lymph nodes around the abdominal aorta. Fine needle aspiration cytology of the pancreatic lesion and laparoscopic para-aortic lymph node biopsy revealed adenocarcinoma, including clusters of invasive micropapillary carcinoma (IMPC).

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A 74-year-old female, who was diagnosed with superficial esophageal cancer, underwent endoscopic submucosal dissection (ESD) at another hospital, but a perforation occurred during the procedure. The perforation was closed with endoscopic clips, and the ESD was halted. The patient was referred to our hospital, and ESD was retried.

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Russell body gastritis (RBG) is an unusual type of chronic gastritis characterized by marked infiltration of Mott cells, which are plasma cells filled with spherical eosinophilic bodies referred to as Russell bodies. It was initially thought that () infection was a major cause of RBG and that the infiltrating Mott cells were polyphenotypic; however, a number of cases of RBG without infection or with monoclonal Mott cells have been reported. Thus, diagnostic difficulty exists in distinguishing RBG with monoclonal Mott cells from malignant lymphoma.

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Background And Study Aims: Magnifying endoscopy with narrow-band imaging (ME-NBI) is more reliable than chromoendoscopy (CE) for delineating the horizontal extent of early gastric cancers prior to endoscopic submucosal dissection (ESD). However, the added benefits of ME-NBI over CE in terms of the difference in magnification level have yet to be elucidated. The aim of this study was to investigate the improvement in diagnostic accuracy for tumor delineation obtained with different magnification levels of ME-NBI following CE.

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The Pat1 gene is expressed in the immature oocytes of Xenopus, and is reportedly involved in regulating the translation of maternal mRNAs required for oocyte-maturation. However, it is still unknown when Pat1a first appears in the differentiating ovary of amphibians. To address this issue, we isolated the full-length Pat1a cDNA from the frog Rana rugosa and examined its expression in the differentiating ovary of this frog.

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The role of anti-Müllerian hormone (AMH) during gonad development has been studied extensively in many species of mammal, bird, reptile, and fish but remains unresolved in amphibians. In male mammalian embryos, Sox9 activates AMH expression, which initiates regression of the Müllerian ducts. However, Sox9 (Sry-related HMG box 9) is unlikely to initiate AMH in chicken, because AMH precedes Sox9 expression in this species.

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The shortage of medical doctors is now a serious social problem in Japan. There are 2.1 physicians per 1000 residents in Japan, fewer than most other OECD countries.

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