title: Gastrointestinal: Pneumoperitoneum caused by acute perforated appendicitis.
authors.affiliation: Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
authors.forename: X
authors.initials: X
authors.lastname: Xu
authors.affiliation: Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
authors.forename: C
authors.initials: C
authors.lastname: Zheng
authors.affiliation: Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
authors.forename: B
authors.initials: B
authors.lastname: Li
authors.affiliation: Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
authors.forename: X
authors.initials: X
authors.lastname: He
mesh_terms: D000005:Abdomen / Q000000981:diagnostic imaging; D000208:Acute Disease; D001064:Appendicitis / Q000150:complications* / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008875:Middle Aged; D011027:Pneumoperitoneum / Q000000981:diagnostic imaging* / Q000209:etiology*; D014057:Tomography, X-Ray Computed