Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Synovial cyst, popliteal
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
Synovial cyst, popliteal: 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.