Case 1
History:
35 year old male presented with knee pain and limited extension 10 months post-arthroscopic repair of a ruptured anterior cruciate ligament.
Findings:
Sagittal and axial MRI images of the knee showing a well-circumscribed soft tissue mass protruding anteriorly between the femoro-tibial joint space.
Diagnosis:
Discussion:
A cyclops lesion is a nodular structure formed by fibrous granulation tissue usually located anteriorly along the ACL graft. A cyclops lesion may develop from the residual native ACL stump or may develop from a primarily torn, non-repaired ACL tear. The patients complained of limited knee extension. The lesions are usually amenable to arthroscopic resection.
References:
- Bradley DM, Bergman AG, Dillingham MF.MR imaging of Cyclops lesions.AJR Am J Roentgenol. 2000 Mar; 174(3):719-26
- Stoller DW, Cannon WD, Anderson LJ .MRI in Orthopaedics and Sports Medicine, 2nd Edition, Lippincott- Raven Publishers, Philadelphia,1997: 340.
