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Definition of Cyst, synovial, of the popliteal space

Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026

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.