Two Cases of Anorectal Malignant Melanoma showing Prolonged Survival after Local Additional Excision Followed by Biopsy and Abdomino-perineal Resection followed by Incisional Biopsy

Takuo Nishina, Katsuyuki Kunieda, Kiichi Miya, Shigetoyo Saji, Kuniyasu Shimokawa, Masahiro Katada²⁾ and Kei Watanabe³⁾

Department of 2nd Surgery and Laboratory Medicine¹⁾, Gifu University School of Medicine. Department of Surgery, Hakuhoukai Sumi Hospital²⁾ Kakuseikai Gifu Central Clinic³⁾

Malignant melanoma of the anorectal region (ARM) is relatively rare and is considered one of the most lethal malignant tumors. We encountered 2 cases with a long survival time. In Case 1, a 76-year-old-male with hypomelanotic ARM was treated by additional local excision followed by polypectomy (histological wall invasion; m) and survived for over 7 years without any signs of recurrence. In Case 2, a 72 year-old female was discovered to have an approximately 48-mm-diameter infiltrating polypoid ARM, and was treated by abdomino-perineal resection with D2 lymphadenectomy four weeks after incisional biopsy (histological wall invasion; sm, v0, ly0, n (-), Stage I). She survived for about 4.1 years after the operation without any signs of recurrence.

Key words
anorectal malignant melanoma, long-term survival of the anorectal malignant melanoma, biopsy for the anorectal malignant melanoma

Reprint requests
Takuo Nishina Department of 2nd Surgery, Gifu University School of Medicine 40 Tsukasa-cho, Gifu, 500-8076 JAPAN

Accepted
November 29, 2000

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