Angiomyolipoma arising in the thigh

A 41-year-old man presented with an asymptomatic mass in the right medial t high. Magnetic resonance imaging (MRI) revealed a well-demarcated, 10-cm ma ss in the right adductor muscles. The margins of the mass exhibited high si gnal intensity and the rest showed low or iso signal intensity on T1-weight ed MR images. However, the high signal intensity was decreased on T2-weight ed images with fat suppression. The central part of the tumor was of inhomo geneous high signal intensity on T2-weighted images; after Gd-DTPA injectio n it enhanced inhomogeneously on T1-weighted images with fat suppression. O n dynamic computed tomography (CT) in the arterial phase, there were strong ly enhancing spotty areas in the tumor. At surgery, a yellow-whitish tumor was resected and a pathological diagnosis of angiomyolipoma (AML) in the th igh was made.