Angiosarcoma arising in an arteriovenous fistula site in a renal transplant patient: a case report and literature review.

Angiosarcoma in the setting of immunosuppressed renal transplant recipients is exceedingly rare. In this report, we describe the occurrence of angiosarcoma arising at an arteriovenous fistula site of a 39-year-old renal transplant recipient that clinically mimicked a thrombosed aneurysm. These tumors are histologically high-grade and clinically aggressive malignancies. They have a predilection for arteriovenous fistula sites. The literature on this uncommon entity is reviewed and possible histogenesis is discussed.