(Fig 1-C.11) Meniscal Cysts of medial meniscus

https://youtu.be/ddzGp0w96S4

https://youtu.be/VHbQLFiofuc

★ Meniscal Cyst Overview: ★

1️⃣ Intrameniscal Cysts:

• Appear as an increased signal within an enlarged meniscus.

2️⃣ Parameniscal Cysts:

• Appearance: Lobulated lesions with increased signal adjacent to the meniscus.
• Location: May extend along tissue planes.

 

✅ Medial Cysts:

• Can extend anteriorly to lie superficial to the Medial Collateral Ligament (MCL).

✅ Lateral Cysts:

• May extend anteriorly to lie deep to the iliotibial band and posterolaterally to lie deep to the Lateral Collateral Ligament (LCL).

 

3️⃣ Parameniscal Cyst Specifics on T2-weighted Imaging:

• It is defined as a high-signal-intensity fluid collection either directly overlying a meniscus or adjacent to a meniscus with a fluid track connecting to the periphery of a meniscus.

 

4️⃣ Association with Meniscal Tears:

• There is a strong association between the presence of a parameniscal cyst and an underlying meniscal tear.
• The association rates between parameniscal cysts and meniscal tears in MRI series have ranged from 90% to 100%.
• 📌 Exception: At the anterior horn of the lateral meniscus, an underlying meniscal tear was found in only 64% of patients with these parameniscal cysts.

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