Chondrosarcoma - femur
Painful left knee.
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There is a large osteolytic lesion of the distal femur with enhanced tumoral matrix, containing rings and arcs calcification (cartilaginous matrix) with endosteal scalloping and cortical breach at several levels (mainly anterior). A soft tissue extension is noted mainly towards the lateral femoropatellar joint. A mild joint effusion is noted.
CT features highly suggestive of a chondrosarcoma