Medical Definition of Cyst, synovial, of the popliteal space
Cyst, synovial, of the popliteal space: A swelling in the space behind the knee (the popliteal space). The swelling is composed of a membrane-lined sac filled with synovial fluid that has escaped from the joint. Commonly called Baker's cyst.
Last Editorial Review: 6/9/2016
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