title: The fuzzy fluid level sign: reappraisal of its cause and diagnostic value.
mesh_terms: D000038:Abscess / Q000000981:diagnostic imaging*; D000388:Air; D001826:Body Fluids; D005750:Gastric Juice; D006801:Humans; D011095:Polyethylenes; D011187:Posture; D011860:Radiography, Abdominal; D013902:Radiography, Thoracic; D013270:Stomach / Q000000981:diagnostic imaging; D013369:Subphrenic Abscess / Q000000981:diagnostic imaging; D013679:Technology, Radiologic
chemical_list: D011095:Polyethylenes