MRI
Well-defined lobulated soft tissue mass of the anterolateral aspect of the left thigh of intramuscular location within the vastus lateralis muscle. It appears isointense to muscle on T1, heterogeneously hyperintense on T2 and STIR with numerous signal voids serpiginous vascular structures. The postcontrast dynamic sequences demonstrate a progressive heterogeneous enhancement with almost complete fill-in on the delayed sequences.