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Rectal Malignant Amelanotic Melanoma with Multiple Lesions, Report of a Case Ryosuke Sakemi 1 , Suketo So 1 , Yosuke Morimitsu 2 , Hiroshi Ishihara 1 , Kenjiro Kuhara 1 , Yuichiro Oku 1 , Hiroya Terabe 1 , Masahiro Kishi 1 , Tomoyuki Nitta 3 , Hironobu So 3 , Yasuhiko Kubo 1 , Satoru Matsugaki 1 , Masayuki Shimokobe 1 , Hiroshi Goto 4 1Department of Gastroenterology, Tobato Kyoritsu Hospital, Kitakyusyu, Japan 2Division of Pathology, Tobato Kyoritsu Hospital, Kitakyusyu, Japan 3Division of Surgery, Tobata Kyoritsu Hospital, Kitakyusyu, Japan 4Aobadai Hospital, Kitakyusyu, Japan Keyword: 直腸悪性黒色腫 , 拡大内視鏡 , 多発病変 , Junctional activity , c-kit pp.1088-1095
Published Date 2014/6/25
DOI https://doi.org/10.11477/mf.1403114210
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 A 78-year-old woman with melena was found to have an elevated rectal lesion during a colonoscopy, thereby the patient was referred to our department.

 Repeat colonoscopy revealed a 10mm reddish lesion of type 0-Is+IIc with a satellite nodule 4mm in diameter. Endoscopic diagnosis showed a poorly differentiated carcinoma and a neuroendocrine carcinoma. The lesion invasion depth was limited to the submucosa as shown by preoperative imaging. Because no obvious metastatic lesions were noted, we performed abdominoperineal resection with D2 lymph node dissection. Microscopically, the tumor cells reacted positively to immunohistological staining with HMB-45 and S-100. Melanin was observed in only a few tumor cells. The final pathological diagnosis was malignant amelanotic melanoma depth MP, and the satellite lesion was m, n0.


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電子版ISSN 1882-1219 印刷版ISSN 0536-2180 医学書院

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