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Age / Sex : 33 / M
Age/Sex: 33/M
C.C.: knee pain
1) What is your impression?
Courtesy : Jeong Ah Ryu, MD., Myongji Hospital
Diagnosis: PVNS
Discussion
Findings:
- On T2WI and PDWI, intermediate signal intensity soft tissue mass lesion at the anterior aspect of the anterior cruciate ligament. It looks like a cyclops lesion, however there is no history of previous surgery.
Differential Diagnosis:
Nodular synovitis / intraarticular loose body / partial tear of ACL
Diagnosis: PVNS
Discussion:
- Endoscopy : Yellowish synovium-lined soft tissue mass at anterior aspect of ACL, attached to the surface of infrapatellar fat pad
- Pathology : Massive infarcted polypoid tissue covered with synovial cells and composed of medium-sized polyhedral cells, foamy cells, and a few giant cells containing fat and hemosiderin, with focal hyalinization, consistent with pigmented villonodular synovitis.
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