Anorectal Malignant Melanoma, Report of a Case Hideaki Kawabata 1 , Eisai Cho 1 , Kanade Katsura 2 , Takuya Saito 3 , Yoshihiro Ikeda 4 , Masatoshi Miyata 1 , Moose Ueda 1 , Koji Uno 1 , Kiyohito Tanaka 1 , Kenjiro Yasuda 1 , Masatsugu Nakajima 1 , Atsushi Takenaka 3 1Department of Gastroenterology, Kyoto Second Red Cross Hospital, Kyoto, Japan 2Department of Pathology, Kyoto Second Red Cross Hospital, Kyoto, Japan 3Department of Surgery, Kyoto Second Red Cross Hospital, Kyoto, Japan 4Department of Dermatology, Kyoto Second Red Cross Hospital, Kyoto, Japan Keyword: 直腸肛門部 , 悪性黒色腫 , 大腸内視鏡 , 超音波内視鏡 pp.1290-1296
Published Date 2007/7/25
DOI https://doi.org/10.11477/mf.1403101163
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 A seventy something woman presented a mass protruding from her anus for about one year. A 4 cm-sized, black-to-blackish-brown, lobulated, pedunculated mass with white coating was identified in the anorectal region. Blackish pigmentation was observed from the tumor to the anal skin. A cap-fitted colonoscope was used for close observation. EUS and magnifying endoscopy revealed specific findings. The biopsy specimen showed malignant melanoma. As no obvious metastatic lesions were noted, abdominoperineal resection with D2 lymph nodes dissection was performed. Histopathologically, melanoma cells were shown to have invaded from the subepithelium to the submucosa with no lymph node metastasis.

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