DESCRIPTION:
Multiple well-defined pedunculated exophytic lesions project from the metaphyseal region of the distal femur and proximal tibia, oriented away from the left knee joint. There is medullary continuity with the bone of origin. The epiphyses and joints are uninvolved.

Well-defined osseus excrescence of the right fibular head which has medullary continuity with the fibula, and very little if any osteoid matrix. The lesion wraps around the tibia posteriorly, and causes deformity of the tibia but no invasion/destruction. Similar lesions are found in the distal tibae bilaterally, causing deformity of the adjacent fibulae.