title: A valve. An explanation of the formation of popliteal cysts.
mesh_terms: D001344:Autopsy; D002061:Bursa, Synovial; D006801:Humans; D007717:Knee / Q000033:anatomy & histology / Q000503:physiopathology; D007719:Knee Joint; D011312:Pressure; D013581:Synovial Cyst / Q000209:etiology*; D013582:Synovial Fluid; D013583:Synovial Membrane