Anal malignant melanoma presenting as a primary tumor: a rare case report

A fifty year old hypertensive male presented in the outpatient department with the chief complaints of bleeding per rectum associated with tenesmus while passing stools along with a complaint of a mass protruding from the rectum. A colonoscopic evaluation and biopsy revealed a lesion at the anal region which was suggestive of a malignant melanoma, while the PET CT revealed a hypermetabolic circumferential wall thickening involving the anal canal and distal rectum with metastatic pelvic nodes, and hepatic metastasis. He was then taken up for a Laproscopic Abdomino perineal resection with an end colostomy. His histopathology with immunohis to chemistry studies were suggestive of high grade malignant melanoma