Reason: evaluation of posterior knee soft tissue mass History: same, present, The medial and lateral meniscus appear intact. The cruciate and collateral ligaments appear intact. No bone marrow signal abnormality is identified. The extensor mechanism appears intact. There is linear decreased signal abnormality within the articular cartilage along the lateral facet of the patella, centrally, that may represent a partial-thickness articular cartilage cleft. There is a small amount of fluid within the joint which extends posteromedially into a lobulated Baker's cyst which measures approximately 4 cm in the craniocaudal dimension. There are foci of increased signal abnormality on T1-weighted images internally which may represent blood products/hemorrhage. There is thin peripheral and septal enhancement on postcontrast sequences. There is a skin marker in the overlying area presumably corresponding to the patient's palpable area of concern. There is edema within the quadriceps fat pad which is nonspecific and may be of no clinical significance, but can be seen in patient's with fat pad impingement. The imaged musculature of the left knee normal appearance. The tibial tubercle trochlear groove distance is normal. No evidence of patella alta.
1. Lobulated Baker's cyst corresponding to the patient's area of concern.2. Probable partial-thickness articular cartilage cleft along the lateral facet of the patella.3. Edema within the quadriceps fat pad is nonspecific and may be of no clinical significance, however, this can be seen in patient's with fat pad impingement.