74 year old female with a history of breast cancer, venous insufficiency, presents with right knee pain and swelling for the past few months with medial joint tenderness on exam. Concern for meniscal injury. MENISCI: There is globular increased signal abnormality in the posterior horn of the medial meniscus consistent with intrasubstance degeneration. The medial and lateral meniscus appear intact.ARTICULAR CARTILAGE AND BONE: There is near full-thickness to full-thickness articular cartilage degeneration along the medial facet of the trochlea with underlying bone marrow signal abnormality. There is full-thickness articular cartilage degeneration along the medial and lateral facets of the patella with underlying bone marrow edema type signal, likely degenerative in etiology. LIGAMENTS: The cruciate and collateral ligaments appear intact. EXTENSOR MECHANISM: The extensor mechanism appears intact.ADDITIONAL
1. Multilobulated collection along the posterior aspect of the knee most consistent with popliteal cyst formation. 2. Articular cartilage degeneration and other findings as described above.