title: Presence or absence of gas in the appendix: additional criteria to rule out or confirm acute appendicitis-evaluation with US.
authors.forename: P M
authors.initials: PM
authors.lastname: Rao
mesh_terms: D000208:Acute Disease; D001064:Appendicitis / Q000000981:diagnostic imaging*; D001065:Appendix / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005740:Gases; D006801:Humans; D014463:Ultrasonography
chemical_list: D005740:Gases