“ Usually incidental, may present with a painless, enlarging deformity. About 1% become malignant. Plain film • Cortical and medullary bon...
“
Usually incidental, may present with a painless, enlarging deformity. About 1% become malignant.
Plain film
• Cortical and medullary bone protruding from a bone (more difficult to appreciate if arising from a flat bone).
• Tends to be directed away from the joint (due to tendon/muscle forces).
• Cartilaginous cap that may contain chondroid calcification.
• Benign lesions can reach 10 cm in size.
• Continued lesion growth, particularly of the cartilage cap, is suggestive of malignancy.
• Cartilage cap should not exceed 1.5 cm after skeletal maturation.
CT
• Gold standard for demonstrating the characteristic cortical and medullary continuity of the lesion.
• Also sensitive for demonstrating the cartilaginous cap.
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