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Chondrosarcoma

• Most often occurs in 5^th or 6^th decades

• Pelvis most frequent bone involved

• Also femur, tibia, humerus

• Most often geographic bone lesion

• Sometimes permeative

• Destruction of bone occurs late in disease

• Large soft tissue mass is common

• Frequently calcifies with punctate or circular opacities

• May produce thickening of the cortex

• May have periosteal reaction

• Secondary chondrosarcoma

• From pre-exiting skeletal lesion

• Osteochondroma

• Enchondroma

• Parosteal chondroma

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