Dr. Thompson,
It is actually prefemoral fat pad- not uncommonly involved in patellofem impingement / friction patients- with about 60% frequency.
It was 1st reported in my 2010 review article.
See attached images how it can get friction edema like in your case- adventitial bursa, pvns and bodies. Mostly, lateral aspect of the prefem fat pad is involved in impingements.
Avneesh Chhabra, M.D. M.B.A.
Professor Radiology & Orthopedic Surgery
Chief, Division of Musculoskeletal Radiology
UT Southwestern Medical Center, Dallas, Tx
5373 Harry Hines Blvd.
Dallas, Tx-75390-9178
Office: 214-648-2122
avneesh.chhabra
