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- Anorectal melanoma: a rare entityPublication . Relvas, Luís Miguel; Gago, Tânia; Velasco, Francisco; Barros, Sónia; Carvalho, Isabel; Caldeira, PauloAnorectal melanoma is a rare malignant tumor with the potential of simulating a benign anorectal disease, making its diagnosis difficult. We describe a case of anorectal melanoma, in which the interpretation of symptoms as hemorrhoidal disease delayed diagnosis and appropriate intervention.