Melanoma primario de recto: una neoplasia infrecuente con una forma de presentación atípica / Primary melanoma of the rectum: an infrequent neoplasia with an atypical presentation

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Primary anorectal melanoma is a rare malignancy with an extremely aggressive biological behaviour. The main clinical presentations are local symptoms such as rectal bleeding, anal mass or pain, or a change in bowel habits. The tumour is frequently mistaken for benign conditions as haemorrhoids or rectal polyps. Many treatments can be used: surgery, chemotherapy, radiotherapy, immunotherapy and even biotherapy. Despite this, the disease has a very poor prognosis and 5 years