Adventitial bursitis secondary to a distal femoral osteochondroma

Case contributed by Ahmad R. AlAli
Diagnosis almost certain

Presentation

Medial knee pain aggravated by walking, of two weeks duration.

Patient Data

Age: 15 years
Gender: Male
This study is a stack
Sagittal
T1
This study is a stack
Coronal
T1
This study is a stack
Axial
T1
This study is a stack
Sagittal
3D GRE
This study is a stack
Coronal T2
fat sat
This study is a stack
Sagittal
T2 fat sat
This study is a stack
Axial T2
fat sat
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Info

A sessile osteochondroma is noted arising from the medial aspect of distal femoral diaphysis measuring about 7 x 8 mm with overlying cartilage of about 1 mm in thickness. The lesion abuts the vastus medialis muscles.

An isointense T1W and hyperintense T2W area are in the deep soft tissues underneath the vastus medialis muscle, suggestive of adventitious bursitis.

Case Discussion

This case beautifully illustrates adventitious bursa formation as a result of chronic soft tissue friction and irritation secondary to an osteochondroma.

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