Humeral exostosis (osteochondroma)
Focal bone swelling.
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Typical appearance of a humeral exostosis, a common finding in children presenting with a mass in the extremity. There is a cortical and medullary external focal protrusion with typical continuity of the lesion with the underlying native bone.
An ultrasound examination would show an overlying hyaline cartilage cap (osteocartilaginous exostosis/osteochondroma) .
An exostosis (osteochondroma) is the most common benign bone tumor, that grows from metaphysis of bones that undergo endochondral bone formation. This case is a classic example of a sessile osteochondroma.
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- 1. Richardson RR. Variants of exostosis of the bone in children. Semin Roentgenol. 2005;40 (4): 380-90. doi:10.1053/j.ro.2005.01.020 - Pubmed citation