Case Presentation: An eight-week-old infant presented to the emergency department in cardiac arrest. Return of spontaneous circulation was obtained and the patient subsequently began seizing. Point-of-care ultrasound of the anterior fontanelle revealed an extra-axial fluid collection consistent with subdural hematoma (SDH).

Discussion: Abusive head trauma is still frequently missed on initial presentation. In addition to validated screening clinical prediction rules, point-of-care cranial ultrasound can be used as a noninvasive adjunct for detection of SDH related to abusive head trauma in infants with an open fontanelle.