Intraosseous lipoma of the distal femur: MRI findings
A 55-year-old woman complained of chronic knee pain lasting for almost a year without previous trauma or signs of inflammation. She was referred for a routine MRI of the left knee to rule out internal derangement.
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Plain films had not been obtained prior to the MRI examination. T1-weighted MRI (Fig. 1a) and T2* GRE (Fig. 1b) showed a bright lesion with sclerotic wall thickening and bony septa. On STIR (Fig. 2a) and fat-suppressed, PD-weighted images (Fig. 2b), most of the interior signal of the lesion was suppressed, except for some irregular hyperintense inclusions. The lesion showed no signs of aggressive behavior. Intravenous contrast medium was not administered.