The benign giant cell tumor of the ankle joint - a rare differential diagnosis of a soft tissue tumor of the foot

The giant cell synovialoma is a benign neoplasia classically located in the fingers. It mostly rises from tendon sheaths, sometimes from the synovia. Other locations than the fingers are rare. Making a differential diagnosis to lipomas, gangliomas or even malignant soft tissue tumors can be very dif ficult especially in rare locations. We report the case of a 21 years old m an suffering from a giant cell synovialoma in the area of the right ankle j oint. The clinical, radiological and patho-morphological findings are docum ented. The tumor was excised totally, other foci were not found. The proble ms of making the right diagnosis are described.