Morisons Pouch Air doges Cap Sign

Triangular or linear collection of air in the posterior intraperitoneal recess bounded anteriorly by the liver and posteriorly by the right kidney may simulate the conformation of the tip of a doge's cap, the ceremonial headgear worn only by the doges of Venice34 (Fig. 78). Potential simulators include gas in the duodenal bulb, a gas-filled gallbladder, and intraperitoneal abscess, or a malrotated bowel.

Doge Cap Sign Radiology

Fig. 7—26. Ligamentum teres fissure sign.

(a) Free air in the fissure in a patient with a perforated duodenal ulcer. This was the only sign of free air on plain films and CT scan. A digital radiograph shows two distinct small round and tubular lucencies (arrow) representing free air trapped within this V-shaped fossa, a variant configuration of this peritoneal recess.

(b) CT confirms the plain film findings. (From Cho and Baker.4)

Fig. 7—26. Ligamentum teres fissure sign.

(a) Free air in the fissure in a patient with a perforated duodenal ulcer. This was the only sign of free air on plain films and CT scan. A digital radiograph shows two distinct small round and tubular lucencies (arrow) representing free air trapped within this V-shaped fossa, a variant configuration of this peritoneal recess.

(b) CT confirms the plain film findings. (From Cho and Baker.4)

Fig. 7—27. Fat in the ligamentum teres fissure.

This vertical lucency is longer, less lucent, and not as sharply defined as a free air collection within this space.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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