Reason: right thigh mass? Lipoma? History: right mobile thigh mass, mostly painless Patient motion artifact limits multiple sequences. A skin marker overlies the lateral aspect of the right thigh presumably corresponding to the patient's palpable area of concern. There is a lobulated mass situated within the proximal thigh within the vastus lateralis muscle which demonstrates predominantly fat signal intensity with some internal septations, measuring 5.0 x 2.0 x 6.5 cm. No dominant nodular nonadipose elements are identified. No bone marrow signal abnormality is seen. Metallic susceptibility artifact from the patient's right total hip arthroplasty limits evaluation of the right hip. There is a small right-sided hydrocele. The remaining soft tissues of the right thigh are unremarkable.
Adipocytic tumor of the vastus lateralis likely representing a lipoma or less likely an atypical lipomatous tumor.