Figure 3a. Deep intramuscular lipoma of the thigh in a 64-year-old woman with a slowly enlarging soft-tissue mass. (a) Radiograph of the proximal thigh shows a radiolucent soft-tissue mass (arrows). (b) CT scan reveals the low-attenuation lipomatous mass (*) with thin septa (arrowheads) in the anterior compartment of the thigh. (c, d) Axial T1-weighted (500/17) (c) and T2-weighted (2100/90) (d) MR images reveal a mass that is isointense relative to subcutaneous fat with both pulse sequences (*) and that contains thin delicate septa (arrows), which remain predominantly low signal intensity on the long TR image (d). (e) Photograph of the axially sectioned gross specimen demonstrates the lipomatous mass (*) with thin septa (arrowheads).