A fluid-filled synovial sac arising in the popliteal fossa as a distention of (typically) the gastrocnemial-semimembranous bursa; not a true cyst
Can be unilateral or bilateral
Painless mass arising in the popliteal fossa
Most cysts are asymptomatic.
Dull ache if cyst is large enough to impede joint motion—typically a restriction of flexion
Painful if cyst rupt...
No treatment if asymptomatic
Treat any associated underlying conditions.
Compressive wrap or sleeve for comfort
Variable; many cysts remain asymptomatic.
Some cysts resolve with treatment of underlying etiology (e.g., gout, rheumatoid arthritis).
In children, most cysts resolve without treat...
Akagi R, Saisu T, Segawa Y, et al. Natural history of popliteal cysts in the pediatric population. J Pediatr Orthop. 2013;33(3):262–268. [View Abstract on OvidMedline]
M71.20 Synovial cyst of popliteal space [Baker], unspecified knee
M71.21 Synovial cyst of popliteal space [Baker], right knee
M71.22 Synovial cyst of popliteal space [Baker], left knee
Conservative treatment of Baker cysts is preferred in children, as most will spontaneously resolve.
In adults, treatment of underlying cause may resolve Baker cysts.
Pain, bruising, and ...
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