title: Emphysematous cholecystitis.
abstract: The radiographic spectrum of emphysematous cholecystitis can be divided into three stages. Diagnosis on plain abdominal film is difficult in the first stage. Two cases are presented in which a circular gas filled structure in the right upper quadrant led to a correct diagnosis in the earliest stage. This was confirmed by obtaining contrast studies to rule out other etiologies.
mesh_terms: D000368:Aged; D002764:Cholecystitis / Q000000981:diagnostic imaging*; D004646:Emphysema / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D011859:Radiography