10-year-old female with multiple hereditary exostosis, known osteochondroma on the distal aspect of the tibia and medial aspect of the distal femur. MENISCI: Intact without evidence of tear.ARTICULAR CARTILAGE AND BONE: Articular cartilage is intact without focal chondral defect.Multiple exostoses on the posterior aspect of the proximal fibula extending superiorly. Distal cortical undulations of the femur likely representing multiple exostoses with medium signal cartilaginous cap.There is increased fluid signal along the medial aspect of the fibula likely representing effusion at the tibiofibular articulation. Corresponding increased reactive marrow signal tibiofibular articulation.Posterolateral exostosis of the proximal fibula with cartilaginous cap. Surrounding undulation along the medial aspect of the proximal tibia with cartilaginous cap representing multiple exostoses.LIGAMENTS: Anterior and posterior cruciate ligaments are intact. The MCL and LCL complexes are intact.EXTENSOR MECHANISM: Extensor mechanism is intact.ADDITIONAL
1. Multiple exostoses as described above.2. Edema within the vastus lateralis secondary to the largest femoral exostosis.3. Joint effusion within the tibiofibular articulation.