(Fig 4-D.07) Comparison of Parameniscal Cysts and Infrapatellar Ganglion Cysts

https://youtu.be/kf7TK8mGFkU

https://youtu.be/YiEAI7pISIU

 

 

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📌 Hoffa’s Fat Pad Ganglion Cysts and Parameniscal Cysts

✅ Hoffa’s Fat Pad Ganglion Cysts

• Hoffa’s fat pad ganglion cysts are most commonly found in the Hoffa fat pad, typically adjacent to the anterior horn of the lateral meniscus . 
• On MR imaging, ganglia appear as well-defined, uni- or multi-loculated, fluid-like T2 hyperintense lesions. 
• Depending on their protein content, ganglia may be hypo- or isointense on T1-weighted sequences . 
• An uncomplicated ganglion appears as a well-defined homogeneous non-enhancing fluid-filled collection on MRI. 

 

✅  Parameniscal Cysts

• On T2-weighted imaging, a parameniscal cyst is 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. 
• There is a strong association between the presence of a parameniscal cyst and an underlying meniscal tear. 
• The reported association between parameniscal cysts and meniscal tears has ranged from 90% to 100% in MRI series, except at the anterior horn of the lateral meniscus, where an underlying meniscal tear was found in only 64% of patients with these parameniscal cysts.

 

✅ Differences Between Ganglion Cysts and Parameniscal Cysts

• A parameniscal cyst can simulate a ganglion but is typically smaller and associated with an underlying meniscal tear. 
• Confirming a parameniscal cyst is based on depicting a communication with an adjacent meniscal tear on any pulse sequence. 
• Synovial fluid extrusion secondary to complex and horizontal meniscal tears (lateral more than medial) results in meniscal cyst formation, which may project into Hoffa’s fat pad.

 

References

1. RadioGraphics 2018; 38:2069–2101
2. Osteoarthritis Cartilage. 2016 Mar;24(3):383-97
3. Indian J Radiol Imaging 2021;31:961–974
4. AJR 2012; 199:481–499

 

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#Radiology, #MRI, #GanglionCysts, #ParameniscalCysts, #HoffasFatPad, #MeniscalTears, #T2Imaging, #SynovialFluid, #JointSpace, #MedicalImaging