INTRAMUSCULAR LIPOMA

• Lipomas can be found in the skin, breast tissue, muscles, and even osseous structures.
• Deep chest wall lipomas can appear infiltrative, rather than encapsulated (as seen here).
• Appreciate the predominantly fatty contents of the tumor on all imaging.
• When there is lesion complexity, tissue sampling may be required to rule out well-differentiated liposarcoma.
• Imaging findings which may suggest malignancy include size > 10 cm and thick nodular septae.
  • MRI can be obtained to assess for enhancement of the septae.

Related Radiology Article: Gao Y, Ibidapo O, Toth HK, Moy L. Delineating extramammary findings at breast MR imaging. Radiographics. 2017 Jan;37(1):10-31.