Presentation
Long standing swelling in the medial aspect of right knee.
Patient Data
A large pedunculated lesion arising from the lateral aspect of right distal femoral metaphysis projecting away from the epiphysis. The medullary bone extends into the lesion differentiating it from a cortical tumor.
There is relative constriction of the distal femoral diaphysis and flaring of the metaphysis representing Erlenmeyer flask deformity (metaphyseal flaring) which can be seen in a number of pathologies including multiple hereditary exostoses.
Case Discussion
Osteochondromas are benign bone lesions with a rare malignant potential. Malignancy develops from the cartilaginous cap and can be assessed with ultrasound or MRI. The distal femur is the most common location.
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