Humeral exostosis (osteochondroma)

Case contributed by Dr Sigmund Stuppner


Focal bone swelling.

Patient Data

Age: 3
Gender: Male

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) .

Case Discussion

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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Case information

rID: 48033
Published: 15th Sep 2016
Last edited: 16th Jul 2018
Inclusion in quiz mode: Included

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