title: Air as a negative contrast medium in the study of amebic liver abscess.
mesh_terms: D000388:Air; D003287:Contrast Media; D005188:False Negative Reactions; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D008101:Liver Abscess, Amebic / Q000000981:diagnostic imaging*; D011859:Radiography
chemical_list: D003287:Contrast Media