Retroperitoneal Air – CT

A pneumoretroperitoneum may be appreciated in each of the CT images presented above. In the left image, air is seen surrounding the right kidney, whereas the right image shows retroperitoneal air pushing the bowel centrally on the patient’s right side. [Courtesy...

Pneumoperitoneum – Supine

Free peritoneal air is difficult to assess in a single, supine, plain film study. However, in the study above, one can appreciate the air visualized on both sides of the left hemidiaphragm. [Courtesy of Dr. N. Jaffer]

Pneumoperitoneum – Cupola sign

Cupola sign refers to peritoneal air that is superior to the left lobe of the liver, having the appearance of a long, flat hat, hence the term “cupola” meaning hat. [Courtesy of Dr. N. Jaffer