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Cap Polyposis, Report of a Case Hiroyuki Kobayashi 1 , Takasuke Yoshida 1 , Hideki Kishikawa 2 , Shotaro Nakamura 3 1Department of Internal Medicine, Kitakyusyu Municipal Wakamatsu Hospital 2Department of Surgery, Kitakyusyu Municipal Wakamatsu Hospital 3The Second Department of Pathology, Faculty of Medicine, Kyusyu University Keyword: cap polyposis , 直腸粘膜脱症候群 , 分類不能型大腸炎 pp.213-219
Published Date 1997/2/25
DOI https://doi.org/10.11477/mf.1403105012
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 A 67-year-old woman was admitted to our hospital, complaining of lower abdominal pain and mucoid diarrhea over the last three years. Barium enema and colonoscopy showed circumferential polypoid lesions in the rectum, which were though to be suggestive of mucosal prolapse syndrome (MPS). After about one year follow-up, in addition to the rectal lesions, multiple eroded polypoid lesions surrounded by normal or edematous mucosa appeared in the sigmoid colon. These findings, which were not compatible with MPS, led to srong suspicion of cap polyposis. The patient was treated with corticosteroid and sulfasalazine suppository. However, her symptom worsened and rectosigmoid colectomy was performed. Macroscopic findings of the resected specimen showed multiple polypoid lesions on the apices of transverse mucosal folds separated by normal mucosa. Microscopic findings that the polypoid lesions were composed of elongated tortuous crypts and their surface were covered by ‘cap’ of fibrinopurulent exudate and inflammatory granulation tissue. From these pathological features, we diagnosed this case as cap polyposis. Cap polyposis is a extremely rare condition, which may be confused with other inflammatory bowel diseases such as MPS. We reviewed the literature about the clinical features of this disease.


Copyright © 1997, Igaku-Shoin Ltd. All rights reserved.

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

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