Synchronous anorectal melanoma

肛门直肠的黑瘤是有差的预后的一个很稀罕的肿瘤。直肠的流血是从本地切除的最经常的症状和外科疗法范围到激进的腹会阴切除术。我们报导与周期性的直肠的流血的历史介绍了的一个 75-years-old 男性病人的一个案例，并且其组织病理学说的诊断是黑瘤。肉眼可见地，我们从齿状线在肛门直肠的区域， 0.5 厘米和 1.5 厘米发现二不同肿瘤。第一是有脚的，在薄梗上，是在最大的直径的 1 厘米，并且第二无柄、榴状在最大的直径达到 2.8 厘米。显微镜检查和免疫两个肿瘤的组织化学的分析证实了黑瘤的诊断。这个案例代表肛门直肠的区域的多重同步主要黑瘤，与损害之一是主要黑瘤，第二是卫星损害的可能性。

Anorectal melanoma is a very rare tumor with poor prognosis. Rectal bleeding is the most frequent symptom and surgical treatment ranges from local excision to radical abdominoperineal resection. We report a case of a 75-years-old male patient who presented with a history of recurrent rectal bleeding, and whose histopathological diagnosis was melanoma. Macroscopically, we found two distinct tumors in anorectal region, 0.5 cm and 1.5 cm from dentate line. The first one was pedunculated, on a thin stalk, measuring 1 cm in greatest diameter, and the second one was sessile and nodular measuring up to 2.8 cm in largest diameter. Microscopic examination and immunohistochemical analysis of both tumors confirmed the diagnosis of melanoma. This case represents multiple synchronous primary melanoma of the anorectal region, with a possibility that one of the lesions is primary melanoma and the second one is a satellite lesion.