42-year-old male. Knee pain and swelling and mass left inner thigh. Evaluate for osteochondroma; injury to VMO quad. MENISCI: The medial and lateral menisci are intact.ARTICULAR CARTILAGE AND BONE: There is an osteochondroma arising from the superomedial aspect of the medial femoral condyle with a thin 3 mm cartilaginous cap. The overall dimensions of the osteochondroma is 1.7 x 1 x 1.2 cm. It causes mild impression upon the medial retinaculum and the distal fibers of the vastus medialis muscle. The tibiofemoral and patellofemoral compartment articular cartilage is intact. Bone marrow signal intensity is normal.LIGAMENTS: The cruciate and collateral ligaments are intact.EXTENSOR MECHANISM: The extensor ligament is intact.ADDITIONAL
Small osteochondroma arising from the superomedial aspect of the medial femoral condyle, as described above.