In what abdominal quadrant is free intraperitoneal gas best detected?
Signs of free intraperitoneal gas are most commonly seen in the right upper quadrant, as lucency over the liver; curvilinear, triangular, or linear streaks of gas outlining the edge of liver near the porta hepatis; or gas outlining the falciform ligament. Other signs of free intraperitoneal gas include a curved lucency under the mid-diaphragm resembling a “cupola,” gas trapped in the interhaustral folds (the “triangle” sign), and gas in the pelvis outlining the lateral umbilical folds
