Another great PECARN study: Headache in Traumatic Brain Injuries From Blunt Head Trauma published in Pediatrics, Feb 2015. The objective was to determine risk of TBI in children after trauma with no other sign or symptoms beyond headache. of 27,495 patients, 12, 675 (46.1%) had headache. From 12,675 patient, 2462 (19.6%) had isolated headaches.
Interestingly, clinically important TBI ocuured in 0 of 2462 patients. That means if you have a patient with isolated headaches means no LOC, AMS, no sever HA, no sign of base skull fx , vomiting, seizure,… patient can be safely discharged with parents and does not require a CT!