Leg mass Note that the exam is limited by motion artifact. The patient was unable to complete several sequences and no contrast was administered. Also note that the right lower extremity was imaged in external rotation.There is severe osteoarthritis of the knee. Evaluation is somewhat limited given the presence of artifact from prior ACL repair. Along the anterior portion of the mid diaphysis of the tibia is a cystic collection which measures approximately 9 x 1.5 cm in the greatest craniocaudal and AP dimensions. This collection appears to connect to an additional lobulated collection within the posterior joint space of the knee (series 12 image 17/70). The underlying marrow signal of the tibia in this area is normal.
Cystic collection within the medial knee which appears to extend to an additional collection anteriorly. This may represent a complex Baker's cyst with extension although further evaluation is limited given details provided above.