Football sign – of massive pneumoperitoneum on a supine…
Football sign – of massive pneumoperitoneum on a supine abdominal radiograph. Normally the margins of the abdominal cavity are only faintly visible due to the density difference between intraperitoneal fat and the abdominal wall. However in the setting of pneumoperitoneum, air makes the outline of the distended abdominal cavity extremely distinct and somewhat football-shaped. Sometimes the falciform ligament is outlined centrally like the football’s seam. The sign is most frequently seen in infants with advanced necrotising enterocolitis (as was the case above) but may be seen with any cause of free gas.
Note: Radiopaedia.org was founded in Australia hence the Aussie rules football!
from our tumblr blog: http://radiologysigns.tumblr.com/post/24041716382