Condition	Characteristics
Emphysematous cholecystitis	Gas accumulation in the gallbladder lumen or pericholecystic tissue and linear gas within the wall
Emphysematous pyelonephritis	Streaky, mottled gas distribution over the infected renal fossa that is associated with an ileus pattern
Liver abscess	Amorphous gas accumulation in the liver is possible; basilar atelectasis, right hemidiaphragm elevation, and right pleural effusion
Pneumobilia	Spherical, linear, branching gas accumulation in the liver
Pneumoperitoneum	Triangular gas accumulation in Morison's pouch, oblong accumulation in the subhepatic space, circular accumulation over the liver, and parahepatic gas bubbles lateral to the right edge of the liver