A case of rectal double tumor - Primary rectal malignant lymphoma and primary anorectal malignant melanoma.

概要

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It is very rare to encounter two different malignant tumors in the same organ, in this case the rectum. A 69-year-old woman was admitted to our hospital because of rectal bleeding. Barium enema and colon fiberscopffc examination revealed a sessile white polypoid tumor on the posterior wall 3cm above the dentate line, and pigmentation around the anal canal. Abdominoperineal rectal resection (Mile's operation) was performed. Histopathological and immunohistological examinations of the resected specimen revealed double tumor, one being malignant lymphoma, diffuse B-cell, large cell κ type, and the other malignant melanoma small cell type.
日本大腸肛門病学会の論文