Neonatal gastrointestinal perforation

Small triangular collections of gas between loops of bowel may sometimes be identified. 6 Reflections of the peritoneum normally present on the inner surface of the anterior abdominal wall are not usually identified, but may be visualised by free gas when it lies on either side. [...]the falciform ligament in particular, and occasionally the umbilical ligaments and urachus, may sometimes be identified in the presence of free air (figs 2 and 3). [...]the "football sign", visible on supine view (fig 1).