22-year-old male with knee pain. Had prior ACL repair.

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Case History

Knee pain. No injury.

Technical Factors

Long- and short-axis fat- and water-weighted images were performed.

Case Findings

No microtrabecular or macrotrabecular fracture.
Slightly laterally displaced patella. Massive induration of Hoffa fat pad.
No high-grade chondromalacia of the patellofemoral compartment.
Flexors and extensors are intact.
Partial-thickness chondral thinning of the weightbearing medial femoral condyle. Minimal marginal spurring medial femoral condyle. Stable healing complex vertical tear in the outer red-red zone posterior horn to posterior body of the medial meniscus likely from original pivot-shift injury.
PCL is intact. ACL graft is intact. Giant cyclops lesion anterior to the ACL graft favored over localized PVNS (also known as giant cell tumor of tendon sheath intra-articular).
MCL and LCL are intact.
No high-grade chondromalacia of the lateral compartment. Minimal marginal spurring lateral femoral condyle. No lateral meniscus tear.
Posterolateral corner is intact.
2+ proteinaceous effusion.
Swelling of the subcutaneous tissues anteriorly.

Case Conclusion

ACL graft is intact with giant cyclops lesion anterior to the ACL graft favored over localized PVNS.
Stable healing complex vertical tear outer healing red-red zone posterior horn to posterior body of the medial meniscus likely from original pivot-shift injury.

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