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Solitary Amyloidosis of the Rectum Featuring a Submucosal Tumor causing Hematochezia, Report of a Case Hisatsugu Noda 1 , Naotaka Ogasawara 1 , Yoshitsugu Ito 1 , Konen Obayashi 2 , Yasuhiro Tamura 1 , Yoshihiro Kondo 1 , Ryuta Masui 1 , Shinya Izawa 1 , Naohiko Kawamura 1 , Yasutaka Hijikata 1 , Kentaro Tokudome 1 , Mari Mizuno 1 , Akihito Iida 1 , Yasushi Funaki 1 , Makoto Sasaki 1 , Kunio Kasugai 1 1Department of Gastroenterology, Aichi Medical University School of Medicine, Nagakute, Japan 2Department of Laboratory Medicine, Kumamoto University Hospital, Kumamoto, Japan Keyword: アミロイドーシス , 大腸 , 孤立性 , 粘膜下腫瘍 , AL-κ pp.359-364
Published Date 2014/3/25
DOI https://doi.org/10.11477/mf.1403114097

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 A previously healthy 64-year-old woman presented with hematochezia upon defecation, which she first noticed at the beginning of April, 2012. Colonoscopy revealed a red-colored and congested tumor, measuring approximately 20mm in diameter, in the rectum. The exposed surface of the center of the SMT(submucosal tumor)was somewhat yellow in color and covered with fuzz. Histopathological evaluation of a biopsy specimen obtained from the SMT suggested amyloid deposition. However, other biopsy specimens of the esophagus, stomach, duodenal bulb, second portion of the duodenum, terminal ileum, and other portions of the colon revealed no amyloid deposition. Whole-body CT(computed tomography), PET(positron emission tomography)and bone marrow aspiration revealed no abnormalities. One month later, an EMR(endoscopic mucosal resection)of the solitary amyloidosis was performed to obtain a precise diagnosis of the SMT. Immunohistopathology revealed that the entire SMT consisted of amyloid light chain kappa deposition. Amyloidosis featuring SMT is difficult to differentiate from other SMTs. This case demonstrates that it is necessary to include amyloidosis in a differential diagnosis when a SMT has yellowish features on the exposed surface of the central tumor.


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電子版ISSN 1882-1219 印刷版ISSN 0536-2180 医学書院

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