We report a case of perforation of a walled off appendiceal abscess in a 5-year-old boy who sustained blunt abdominal trauma. The past medical history was significant only for a 4-day episode of abdominal pain 1 month prior to this presentation. Initial laboratory studies were unremarkable, and radiographic studies showed free fluid in the pelvis with no evidence of solid organ injury, but inflammation of the right colon. The final diagnosis was made at laparotomy. We emphasize this unique presentation and review the literature on traumatic appendicitis in children.