School ager who fell off his bike, hitting his abdomen on the handlebars, who then developed abdominal pain

CT of ileal perforation
Axial CT with contrast of the abdomen from the day of admission (above) shows no solid organ injury, no free air and no free fluid in the pelvis. Axial CT with contrast of the abdomen obtained 24 hours later due to a worsening abdominal exam (below) shows new free fluid in the pelvis and no evidence of free air.

The diagnosis was bowel trauma resulting in ileal perforation.