Melanotic adenocarcinoma of the anorectum.María Jesús Coma-del-Corral, Leticia Pérez-Serrano, S Razquin-LizarragaJournal of clinical gastroenterology1990A variety of tumors, besides those formed by melanocytes, may contain melanin pigment. Most of them have originated from the neural crest. Epithelial tumors with melanosomes are very unusual. We… (More)