Fibrous cortical defect (non-ossifying fibroma) - MRI findings

Case contributed by Dr Chris O'Donnell


Hip pain. Incidental finding on plain radiographs.

Patient Data

Age: 7 years
Gender: Female

Poorly defined lytic lesion in the posterior femoral metaphysis

T1 hypointense and T2 hyperintense, lobulated, cortically-based mass (interestingly despite being histologically fibrous they still have increased T2 signal).  It is much more circumscribed on the MRI.

Case Discussion

These are considered to be benign lesions that are self limiting.  They can also be seen following repetitive trauma and are then known as cortical desmoids (due to mechanical pull by the medial head of the gastrocnemius).
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Case information

rID: 19574
Published: 25th Sep 2012
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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