Emphysematous cholecystitis.
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.
D000368:Aged; D002764:Cholecystitis / Q000000981:diagnostic imaging*; D004646:Emphysema / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D011859:Radiography