Giant cell tumour of peroneal tendon sheath
Presentation:
Painless swelling over lateral ankle in an active sportswoman. No deterioration in performance.
Patient Data:
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Dense, well-defined, sausage-shaped soft tissue mass sitting on the postero-lateral aspect of the ankle paralleling the peroneal tendons. The density is due to the presence of haemosiderin.
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T1
Large, lobulated, enhancing, soft tissue mass within the peroneal tendon sheath dispalcing the tendons. Key to the diagnosis is presence of magnetic susceptibility on the gradient echo sequence ie haemosiderin. No bone erosion at this time.
Case Discussion:
These tumours are benign and the tendon sheath equivalent of pigmented villonodular synovitis, hence the presence of haemosiderin. They are more often seen associated the hand tendons - and are quite common in that location.
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