[Primary anorectal melanoma--an uncommon disease with a poor prognosis]

Primary anorectal melanoma is a rare disease with poor prognosis. The optimal treatment of this disease is not well defined. The majority of patients develop generalised recurrent disease and die despite radical surgical treatment. Screening for colorectal cancer may help to detect this disease earlier and the early diagnosis should give better outcome. We present a case report and evaluate--based on literature--epidemiology, most common symptoms, histopathology, diagnosis, treatments and the prognosis of primary anorectal melanomas.