The osteogenic exostosis or osteochondroma usually reveals a tumor siting
preferably in the knee area. Vascular complications exostoses are known and
exceptional even if the frequency of these tumors is important, and we related a case report about a young man of 23 years old who suffers from
a mass filling the popliteal area of the left knee, projecting on the popliteal
pedicle. We proceed to the excision of the entire lesion. The arterial
pseudoaneurysm is the most common vascular complication of exostosis especially
in his popliteal location. MRI angiography is
necessary, to mentioned osteochondroma aspect, the rule is: any painful
exostosis must be removed because the risks of degeneration are real but rare.
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