General
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• Extremely rare
• Benign
• Multilobular masses in chest wall of newborns and infants; may interfere with normal delivery
• Excellent prognosis, treatment may not be required

Xray description
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• Large lesion that deforms one or more ribs

Gross description
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• Islands of cartilage and cysts

Micro description
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• Cartilaginous nodules with variable hypercellularity, cartilage matures into trabecular bone and resembles growth plate
• Spindle cell proliferation with giant cells and aneurysmal bone cysts

Differential diagnosis
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• Chondrosarcoma

Additional references
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• Am J Surg Pathol 1980;4:247

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