A subdural hematoma is a collection of blood in the space between the outer and middle layers of the covering of the brain.
Another type of subdural hematoma called a chronic subdural hematoma can occur in people over age 60.
Infants are more prone to subdural hematoma than toddlers and older children, because the brain of infants has more room than the brain of older children to move around in the skull when shaken or hit.
In infants and children, subdural hematoma is often seen in physical child abuse.
In older children, a fall in which they hit their head is a common cause of subdural hematoma.