... Ishizone S, Koide N, Karasawa F, Akita N, Muranaka F, Uhara H, Miyagawa S: Surgical treatment for anorectal malignant melanoma: report of five cases and review of 79 Japanese cases Int J Colorectal ... Discussion As with other anal canal tumors there is often a delay in diagnosis that results in advanced stage disease at the time of presentation Because anorectal melanomas are rare, staging of the ... 85:1686-1693 Chang AE, Karnell LH, Menck HR: The National Cancer Data Base report on cutaneous and noncutaneous melanoma: a summary of 84,836 cases from the past decade The American College of Surgeons...