Age / Sex : 22 / M

Chief complaint : Left knee pain

PHx: ACL reconstruction (2YA)


What is your diagnosis?

Two weeks later, you can see the final diagonosis with a brief discussion of this case (Please submit only one answer)

Courtesy : 강병성 (Byeong Seong Kang, M.D.), 울산대학교병원 (Department of Radiology, University of Ulsan College of Medicine, Ulsan University Hospital, Ulsan, Korea)

Cyclops lesion

Discussion

Findings

    1.Plain radiograph: ACL reconstruction

2. MR images: well-circumscribed nodule just anterior to distal end
   of graft between femur and tibia

       1)T2-weighted image: low to intermediate signal intensity

       2)T1-weighted image: intermediate signal intensity

       3)Fat-suppressed contrast-enhanced T1-weighted image: heterogeneous enhancement

1.Bencardino JT, Beltran J, Feldman MI, Rose DJ. MR imaging of complications of anterior cruciate ligament graft reconstruction. Radiographics. 2009;29:2115-26.

2.Papakonstantinou O, Chung CB, Chanchairujira K, Resnick DL. Complications of anterior cruciate ligament reconstruction: MR imaging. Eur Radiol. 2003;13:1106-17.

3.Bradley DM, Bergman AG, Dillingham MF. MR imaging of cyclops lesions. AJR Am J Roentgenol. 2000;174:719-26.