[Rectal melanoma: the value of modern treatment].

Rectal melanoma is a rare disease. There is much controversy concerning cause, incidence and treatment of the disease and the spreading of recurrence. In this article, we discuss actual aspects of diagnostic, therapy and prognosis on the basis of our series of seven patients as well as a literature review. The surgical therapy in the form of local tumour excision with a disease-free margin of up to 1-2 cm is the initial therapeutic modality of choice. Large tumours that obviously could not be removed in sano should be treated with a multimodal concept. Such tumours should be treated by a combination of neoadjuvant radiation and chemotherapy for down-staging with subsequent local excision (LE) or abdomino-perineal rectum extirpation (APR). An inguinal lymphadenectomy should only be performed if the lymph nodes are enlarged on clinical or radiological examination. The prognosis of rectal melanoma is markedly poor and is primarily related with the stage of disease. The 5-year survival rate is estimated at about 24% for patients with stage I tumours. Patients with stage II and III tumours have appreciably shorter survival times of 12 months on the average.