Regarding pediatric head injury, all the following are true EXCEPT?
1) Head trauma is the leading cause of death among injured children.
2) A child's cranial vault is larger and heavier in proportion to its total body mass than an adult's.
3) Pediatric epidural hematomas are venous in origin.
4) A brief seizure occurring immediately after the insult, with rapid return to normal level of consciousness is usually unassociated with intracranial parenchymal injury.
5) Retinal hemorrhages are a common finding in mild-moderate trauma.