Rectal Lymphoid Polyp, Report of a Case Katsufumi Kawahori 1 , Hirofumi Nakatsuka 1 , Toshiya Matsuyama 1 , Kiyohiko Dohi 1 , Hitoshi Nakagawa 3 1The Second Department of Surgery, Hiroshima University School of Medicine 3The First Department of Pathology, Hiroshima University School of Medicine pp.999-1004
Published Date 1988/9/25
DOI https://doi.org/10.11477/mf.1403108523
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 A rectal lymphoid polyp is one of very rare and benign non-epithelial tumors, commonly proliferating in the submucosa. It usually is present as a sessile or pedunculated polyp covered with rectal mucosa or anal skin and often eludes clinical diagnosis.

 A 64 year-old woman was admitted to our hospital complaining of bloody stool in July 1986. Digital examination revealed a tumor measuring 45 mm by 40 mm on the lateral wall of the rectum. The tumor was covered with obviously normal rectal mucosa by endoscopy. A polypoid lesion was fragile with erosive and hemorrhagic spots (Fig. 1). Barium enema double contrast picture taken in the oblique supine position revealed a filling defect about 45×40 mm at the Rb area (Fig. 2).

 Transanal local resection was carried out in September 1986.

 Examination of the resected specimen showed a sessile tumor measuring 35 mm by 30 mm by 15 mm with the cross section of the tumor being grayish white in color (Fig. 4). Histologically, the tumor was mainly located in the submucosal layer with partial invasion into the propria muscle. The tumor was composed of lyphoid tissue with follicles in the center. Each follicle, bounded obscurely, had a reaction center composed mainly of mature and juvenile lymphocytes, and plasma cells. All these findings led to the final diagnosis, reactive lymphoid hyperplasia. The patient is very well 33 months postoperatively with uneventful course.

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