[Malignant melanoma of the anus and rectum].

There is approximately 300 cases of malignant melanoma written in the world literature. We write up 13 operated from us for 15 years cases of melanoma of the anus and rectum. The neoplastic localization is usually at linea dentate area. The patients complains are foreign-body filling and rectohaemorrhagy. This formation considers like haemorrhoid frequently. The pain is not common symptom but ulceration occurs in many percent. The metastasing is in the inguinal lymph nodes. The tumor colour is between light-brown to red-purple in 50% of the cases. The colouring matter is absent in the other half of the cases and these tumors consider like nonpigmentous melanoes. Despite the complex treatment--surgical, chemotherapy etc. the prognosis is at large poor.