Doge cap sign (pneumoperitoneum)

Last revised by Henry Knipe on 1 Feb 2023

Citation, DOI, disclosures and article data

Citation:

Yeung J, Knipe H, Shah V, et al. Doge cap sign (pneumoperitoneum). Reference article, Radiopaedia.org (Accessed on 19 Apr 2024) https://doi.org/10.53347/rID-14909

DOI:

https://doi.org/10.53347/rID-14909

Permalink:

https://radiopaedia.org/articles/14909

rID:

14909

Article created:

4 Sep 2011, J Yeung

Disclosures:

At the time the article was created J Yeung had no recorded disclosures.

View J Yeung's current disclosures

Last revised:

1 Feb 2023, Henry Knipe ◉ ◈

Disclosures:

At the time the article was last revised Henry Knipe had the following disclosures:

Integral Diagnostics, Shareholder (ongoing)
Micro-X Ltd, Shareholder (ongoing)

These were assessed during peer review and were determined to not be relevant to the changes that were made.

View Henry Knipe's current disclosures

Revisions:

10 times, by 8 contributors - see full revision history and disclosures

Systems:

Gastrointestinal

Sections:

Signs

Tags:

cases

Synonyms:

Morison's pouch sign
Morison pouch sign
Doge's cap sign

The doge cap sign, also referred to as Morison pouch sign, is a radiographic sign of pneumoperitoneum. It presents as a triangular-shaped (although may also be crescentic or semicircular) gas lucency, usually bound by the 11th rib in the right upper quadrant on abdominal radiographs due to air in Morison pouch.

History and etymology

The appearance of this lucency resembles the characteristic ducal hat (corno ducale in Italian) as warn by the Chief Magistrates of both the Republics of Venice and Genoa in medieval Italy ³.