(Fig 4-D.08) Unruptured Baker’s Cyst

https://youtu.be/M3-qLMEQiDI

https://youtu.be/YiEAI7pISIU

 

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📌 Semimembranosus-Gastrocnemius Bursa: Baker Cyst

• "Baker’s cyst" is a misnomer; it is a fluid distension of the gastrocnemius-semimembranosus bursa, occasionally communicating with the knee joint. 
• A valvular mechanism allows unidirectional joint fluid flow into the bursa.

✅ Etiology and Associated Conditions

Baker’s cysts, also known as popliteal cysts, are often incidental MRI findings. They are linked to:

• Osteoarthritis
• Trauma
• Rheumatoid arthritis
• Gout
• Systemic lupus erythematosus
• Juvenile rheumatoid arthritis

 

✅ MRI Characteristics

• Well-defined unilocular or multilocular cystic masses between the semimembranosus tendon and the medial gastrocnemius head.
• Fluid signal in all sequences. Complications (hemorrhage, rupture, loose bodies) can cause a heterogeneous appearance.
• increased signal in infected or hemorrhagic cysts on T1WI
• High signal intensity edema dispersing into adjacent tissues on fat-suppressed T2-weighted images.

 

References

Insights Imaging (2013) 4:257–272

 

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#BakersCyst, #PoplitealCyst, #KneeMRI, #SynovialCyst, #KneeDisorders, #Osteoarthritis, #RheumatoidArthritis, #Gout, #KneeTrauma, #Radiology