Solitary Extrarenal angiomyolipoma in the knee: A case report and literature review

Abstract

Angiomyolipoma is usually a solitary renal tumour and composed of adipose tissue, blood vessels, and smooth muscles. Extrarenal angiomyolipoma is an uncommon disease and commonly found in liver. Angiomyolipoma in the musculoskeletal tissue particularly in the subcutaneous region of the knee is very rare. Histopathological section of angiomyolipoma shows an admixture of small to medium-sized thickwalled blood vessels, smooth muscle cells and adipose tissue which include different types of mature fat cells. The treatment of AML is wide resection, which is usually curative We describe a case of Angiomyolipoma (AML) in the subcutaneous tissue of the knee joint of a 70 years old male with MRI and histological features of the tumour. There is an only one previous report of this type of case in the literature. To the best of our knowledge, this is the second case of a solitary angiomyolipoma in the subcutaneous tissue of the knee joint area.