title: Giant gas cysts of the sigmoid colon.
mesh_terms: D000368:Aged; D003560:Cysts / Q000000981:diagnostic imaging*; D005260:Female; D005740:Gases; D006801:Humans; D007422:Intestines / Q000502:physiology; D011859:Radiography; D012810:Sigmoid Diseases / Q000000981:diagnostic imaging*
chemical_list: D005740:Gases