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Fig. 3 | The Ultrasound Journal

Fig. 3

From: Diagnosis at gut point: rapid identification of pneumoperitoneum via point-of-care ultrasound

Fig. 3

a Patient placed in the supine position for an initial sonographic assessment for free intraperitoneal air. b Patient placed in the lateral decubitus position to allow free intraperitoneal air to accumulate anterior to the hepatic parenchyma. c Sonographic output of a patient with free intraperitoneal air. Air is a strong reflector of ultrasound waves. Reflection produces bright focal lines (A-lines, red arrow) with dark shadowing in between

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