CTICasesRib Osteochondroma with Malignant Transformation
Imaging findings
CT chest shows a large, lobulated mass arising from the anterior right third rib, demonstrating continuity with the medullary cavity of the rib, associated with thick, irregular calcified cartilage cap matrix, confirmed as low-grade chondrosarcoma arising from an osteochondroma.
Key takeaways
While osteochondromas (exostoses) of the ribs are benign, they carry a risk of malignant transformation to chondrosarcoma. CT features suggestive of malignancy include a thickened cartilaginous cap (typically >1.5-2 cm), rapid growth, and the development of new, irregular calcified matrix.
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