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 Bakers cyst.
CYST, SYNOVIAL, OF THE POPLITEAL SPACE
Meaning of CYST, SYNOVIAL, OF THE POPLITEAL SPACE in English
English dictionary of medicine. Английский словарь медицины. 2012