Leiomyosarcoma of the anus: report of a case

We have presented an unusual case of leiomyosarcoma of the anus. On reviewing the literature, we did not find a similar case. This tumor metastasizes mainly to distant organs through the bloodstream. We treated the tumor by wide excision, followed by chemo-immunotherapy, hoping to sterilize possible microemboli. Since this type of lesion is very aggressive, we strongly suggest that any mass in the perianal region be excised and biopsied.