Lipoma of tibialis anterior tendon sheath
Soft lump on anterior aspect of the ankle. US inconclusive.
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Typical lipoma encasing the tibialis anterior tendon - it "disappears" on fat suppression. No sinister features.
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.