Fig. 5

A mass revealed by physical examination in the left kidney of a 58-year-old woman. a An enhanced, axial abdominal CT image showed a left pararenal fat-density mass, which was diagnosed as liposarcoma. However, this lesion should have been diagnosed as angiomyolipoma instead of liposarcoma. The misdiagnosis may be due to missing key signs such as large blood vessels (arrow) in the tumor and the renal cortical “split sign”