Osteochondroma of the knee - sessile

Case contributed by Dr Domenico Nicoletti


Swelling on the medial side of the right knee

Patient Data

Age: 30
Gender: Female

X-ray right knee

Osteochondroma with regular margins in the proximal metaphysis of the tibia, medially.


MRI right knee

Sessile osteochondroma of the proximal metaphysis of the tibia, medially, with cortical medullary continuity, between the tendons of the pes anserinus that are dislocated. The cartilage cap is normal (up to 3.5 mm). The position of the patella is slightly "high".

Case Discussion

Osteochondromas are bony protuberances surrounded by a cartilage layer. They generally affect the extremities of the long bones in an immature skeleton and deform them. A rapidly increasing lesion size and local pain suggest sarcomatous transformation. 

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Case information

rID: 70248
Published: 9th Aug 2019
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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