The doge cap sign, also referred to as Morison's 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's pouch.
History and etymology
The appearance of this lucency resembles the characteristic ducal hat (corno ducale in Italian) as worn by the Chief Magistrates of both the Republics of Venice and Genoa in medieval Italy 3.
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