Here's info on head injuries from that same site. I haven't read it yet, gonna start now...
http://www.dundee.ac.uk/forensicmedicine/notes/heading.pdf
Great link! thanks.
Here's a quote that expounds on the coroner's comment about gyri and sulci which again, indicates brain swelling:
"Brain swelling (cerebral oedema) is a common and frequently fatal complication of head injury which may develop within minutes or hours of injury. Swelling may accompany diffuse axonal injury or a space-occupying lesion such as an intracranial haematoma. In children brain swelling may be the only identifiable feature of head injury. A swollen brain is heavy, with visible enlargement of the surface convolutions (gyri) at the expense of obliteration of the the intervening gaps (sulci) and compression of the fluid filled cavities (ventricles) deep within the brain. Emergency neurosurgical procedures frequently attempted include drainage of an ICH or removal of severely damaged brain tissue in an attempt to reduce intracranial pressure. Brain swelling is frequently the fatal complication even after such measures."