Baker cyst causing nerve entrapment.
D000368:Aged; D002062:Bursitis / Q000150:complications; D006801:Humans; D007719:Knee Joint; D008297:Male; D008875:Middle Aged; D009408:Nerve Compression Syndromes / Q000209:etiology*; D011152:Popliteal Vein / Q000293:injuries; D012189:Retrospective Studies; D013577:Syndrome; D013581:Synovial Cyst / Q000150:complications*