Popliteal cyst

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[edit] Discussion of Popliteal cyst

  • AKA Baker's cyst
  • A popliteal cyst is fluid distention of a bursa between the gastrocnemius and semimembranosus tendons via a communication with the knee joint.
  • Fluid within a Baker's cyst may communicate freely with the knee joint. However, the presence of a valvelike mechanism may allow joint fluid to communicate in only one direction.
  • Popliteal cysts may be seen with many joint abnormalities, such as internal derangement, osteoarthrosis, or inflammatory arthritis; the most common associations include joint effusion, meniscal tear, and degenerative joint disease.


  • Potential complications:
    • Pseudothrombophlebitis syndrome (rupture, dissection)
    • Deep vein thrombosis
    • Leaking
    • Infection
    • Posterior compartment syndrome
    • Trapped calcified bodies


[edit] Imaging Findings for Popliteal cyst

  • Fluid between the medial gastrocnemius and semimembranosus tendons is characteristic on sonography.
  • Popliteal cysts are T2 bright on MRI.

[edit] Images

Patient #1: MR images demonstate a large popliteal cyst

[edit] See Also

[edit] External Links

[edit] References for Popliteal cyst