Triangle Sign

Air trapped between two bowel loops and also abutting the nearby lateral edge of the peritoneal cavity or a third bowel loop appears as a sharply outlined, triangular lu-cency (Fig. 7-15). Sometimes only two sides of the triangle are well delineated, with the border of the third one less distinct (Fig. 7-16). Although it is not a very sensitive indicator of free air, the triangle sign is highly specific and is best depicted at the periphery of the lower abdomen. The triangle sign is also valuable for confirming that a coincident Rigler's double wall sign is a true manifestation of free air rather than merely a delineation

Rigler Sign

Small triangular collections of free air (arrows) are usually best depicted in the right lower quadrant. Note Rigler's sign of two ileal loops: one distended with fluid (F) and the other with air (A). (From Cho.16)

Small triangular collections of free air (arrows) are usually best depicted in the right lower quadrant. Note Rigler's sign of two ileal loops: one distended with fluid (F) and the other with air (A). (From Cho.16)

of the mural surface by the juxtaposition of a separate bowel loop or by adjacent fat.

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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