Presentation
Chronic knee pain. No history of trauma.
Patient Data
Horizontal tearing of the posterior horn of the medial meniscus, with extension to its under-surface, with a multi-loculated cystic lesion at the posterior aspect of the medial collateral ligament insertion site on the medial femoral condyle, which regarding the medial meniscal horizontal tear, represents a parameniscal cyst. Otherwise, the MCL is unremarkable.
horizontal tearing of the body of the lateral meniscus with small parameniscal cyst.
Mucoid degeneration of the postero-lateral bundle of the anterior cruciate ligament is noted.
Early tri-compartmental degenerative changes and minimal fluid in the popliteal recess are seen.
Case Discussion
Meniscal cysts nearly always occur in association with a horizontal meniscal tear. A direct communication between the cyst and meniscal tear is not always present.
This case represents parameniscal cysts on both sides of the joint.
A medial collateral ligament ganglion cyst is the less probable differential diagnosis for the multi-loculated cyst of the medial side.
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