53-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.
Plain films had not been obtained prior to the MRI examination. T1-weighted MRI showed a bright lesion with sclerotic wall thickening and bony septae.
Case Intraosseous lipoma of the distal femur courtesy of Dr. med. Roberto Schubert via radiopaedia.org