Lipoma of tibialis anterior tendon sheath

Case contributed by Chris O'Donnell
Diagnosis almost certain

Presentation

Soft lump on anterior aspect of the ankle. US inconclusive.

Patient Data

Age: 65
Gender: Female

Typical lipoma encasing the tibialis anterior tendon - it "disappears" on fat suppression. No sinister features. 

Case Discussion

This is a benign lipomatous lesion as occurs in other parts of the body and not lipoma arborescens that usually occurs in joints but can arise in the synovium of the tendon sheath.

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