title: Malignant melanoma in Meckel's diverticulum.
abstract: Meckel's diverticulum is a vestigial remnant of the omphalomesenteric duct, which is rarely affected by neoplasia. The authors report the first case of malignant melanoma in Meckel's diverticulum in a middle-aged man without skin or ocular lesions. Five other Meckel's diverticuli were evaluated histologically and by immunoperoxidase technics for neural crest elements, which could have given rise to this lesion.
mesh_terms: D006801:Humans; D008297:Male; D008467:Meckel Diverticulum / Q000150:complications* / Q000473:pathology; D008545:Melanoma / Q000150:complications* / Q000473:pathology; D008875:Middle Aged