title: Gas in a lumbar extradural juxtaarticular cyst: sign of synovial origin.
mesh_terms: D005740:Gases; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D013122:Spinal Diseases / Q000000981:diagnostic imaging*; D013581:Synovial Cyst / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed
chemical_list: D005740:Gases