<prompt> True about melanoma of the anal canal is -Present usually as anal bleedingAP resection gives better result than local excisionLocal recurrence at the same site after resectionRadiosensitive  <response>: The anal canal is the third most common site for melanoma, following skin and eye.Its a rare tumor comprising less than 1 of anorectal malignancies.It is radioresistant and prognosis is very poor.Clinical presentationaverage age is 50 to 60 yrs.nonspecific symptoms are seen bleeding, pain or anal mass.usually misdiagnosed as thrombosed hemorrhoids.TreatmentMelanoma is resistant to chemotherapy radiotherapySurgery offers the only cure but by the time the symptoms appear, the level of invasion precludes surgical cure in most patients. In these patients, the disease has metastasized or is deeply invasive.A few patients present with isolated local or locoregional disease that is potentially resectable for cure.The two surgical procedures used areWide local excision and APRRecurrence is common and usually occurs systemically regardless of the initial surgical procedure. Local resection does not increase the risk of local or regional recurrence and APR offers no survival advantage over local excision. Because of the morbidity associated with APR, wide local excision is recommended for initial tt of localized melanoma. APR may be required if the tumor involves a significant portion of the anal sphincter or is circumferential. 