Extrarenal Retroperitoneal Angiomyolipoma: A Rare Case

Angiomyolipomas are benign tumors consisting of smooth muscles, vessels, and fat tissue. They are generally located on the kidneys; extrarenal angiomyolipoma is rare. Apart from the kidneys, angiomyolipomas are seldom located in the retroperitoneal area. Moreover, it is quite difficult to diagnose angiomyolipomas located in the retroperitoneal area. Due to the low amount of fat, negative density may not be identified by computed tomography (CT). The purpose of this report was to discuss the case of a retroperitoneal angiomyolipoma that clinically resembles a surrenal tumor and cannot be clearly discriminated from surrenal tissue on CT.