Multiple hereditary exostoses
Patient with a known condition presents on two separate occasions with knee and ankle pain
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Frontal and lateral views of the right knee and right ankle, from two separate presentations.
Multiple metaphyseal and peripheral diaphyseal osteochondromata in the femur, tibia and fibula. No fracture. No features of malignant transformation.
The femur and tibia also demonstrate Erlenmeyer flask deformities.
Distal tibia also demonstrates an incidental, benign enostosis.
This patient presented with knee pain and, to exclude potential chrondrosarcomatous transformation of an osteochondroma cartilage cap, an MRI of the knee was advised.
Multiple hereditary exostoses (MHE) (a.k.a. diaphyseal aclasia) is a recognized cause of Erlenmeyer flask deformity.