Extra-articular en bloc resection of the talocrural and the talocalcaneonavicular joints for primary malignant synovial tumour (myxoinflammatory fibroblastic sarcoma).

A 13-year-old boy presented with a diagnosis of intra-articular myxoinflammatory fibroblastic sarcoma of the ankle. There had been no previous description of a sarcoma arising directly from the synovium of the ankle and limb salvage for malignant tumours of the ankle has rarely been reported. We treated him by peritalar extra-articular resection, and draw attention to this rare tumour and to a technique of limb-sparing resection of the ankle joint.