Pneumoperitoneum

Case contributed by Dr J Yeung

Presentation

Acute abdominal pain.

Patient Data

Age: Elderly
Gender: Female
X-ray

Abdominal x-ray

Abdominal x-ray demonstrates numerous loops of small bowel outlined by gas both within the lumen and free within the peritoneal cavity. There is also ascites, with mottled gas densities over bilateral paracolic gutters.

Annotated image

Annotated

In a normal x-ray only the luminal surface (blue arrows) should be visible outlined by gas. The serosal surface (orange) should not be visible as it is normally in contact with other intra-abdominal content of similar density (other loops of bowel, omentum, fluid).  In this case gas abuts the serosal surface rendering it visible. 

As this film has been obtained supine (note absence of air-fluid levels), ascites pools in the paracolic gutters, with fluid mixed in with gas bubbles (green arrows). 

Case Discussion

Radiographic features of pneumoperitoneum include

  • double wall or Rigler sign
  • telltale triangle sign
  • inverted V sign
  • urachus sign
  • doge cap sign. 

This patient underwent emergency operation. Findings included large amount of faeculent fluid within the peritoneum causing peritonitis. The underlying cause was rupture of jejunal diverticula.

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Case information

rID: 14905
Published: 4th Sep 2011
Last edited: 16th Jul 2018
Inclusion in quiz mode: Included

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