Giant cell tumor of peroneal tendon sheath

Case contributed by Dr Chris O'Donnell


Painless swelling over lateral ankle in an active sportswoman. No deterioration in performance.

Patient Data

Age: 16
Gender: Female

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 hemosiderin.

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 i.e. hemosiderin. No bone erosion at this time.

Case Discussion

These tumors are benign and the tendon sheath equivalent of pigmented villonodular synovitis, hence the presence of hemosiderin. They are more often seen associated the hand tendons - and are quite common in that location.

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