Follow-up MRI after 13 months, confirms the persistent, histologically proven, intraosseous lipoma within the right acetabulum, ischial tuberosity, and inferior pubic rami.
There is a linear cystic component seen best on sagittal sequences extending to a cortical defect consistent with the tract/site of the previous bone biopsy. There is stability of the lesion with mild improvement, reduced cystic component, and no evidence of progression. There is no new soft tissue involvement or pathological fracture.