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Ann Coloproctol. 2016 Oct;32(5):190-194. English. Case Report. https://doi.org/10.3393/ac.2016.32.5.190
Cho I , Kim KJ , Lim SC .
Department of Pathology, Chosun University School of Medicine, Gwangju, Korea. sclim@chosun.ac.kr
Department of Surgery, Chosun University School of Medicine, Gwangju, Korea.
Abstract

A primary anorectal malignant melanoma is a rare tumor. Moreover, cases involving a synchronous anorectal melanoma and colon adenocarcinoma are extremely rare. The authors report a case of a synchronous anorectal melanoma and sigmoid adenocarcinoma in an 84-year-old man. The regions of the anorectal melanoma showed melanocytic nevi in the adjacent mucosa of the anal canal and rectum. A dysplastic nevus was also identified in the anal mucosa. This case demonstrates that an anorectal melanoma can arise from pre-existing anorectal melanocytic lesions.

Copyright © 2019. Korean Association of Medical Journal Editors.