• Also called popliteal cyst
• Synovial cyst in popliteal space
• Due to herniation of synovial membrane through posterior joint capsule or escape of joint fluid from bursae
• Associated with degenerative joint disease, neuropathic arthropathy, rheumatoid arthritis

Popliteal Cyst

• 44 year old woman with lower extremity pain and swelling (Int J Emerg Med 2010;3:469)
• 45 year old man with rheumatoid arthritis and pain in calf (N Engl J Med 2009;361:1098)

• Treat cause of excess fluid, sclerotherapy (Pain Physician 2008;11:375)

Baker's cysts

Left popliteal fossa

• Lined by synovium, may have cartilage in cyst wall

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