Case History: Case G

During an automobile accident, a 23-year-old man seemed to have hit his head on the windshield and side window. he was unconscious for a brief period, then regained consciousness. He went home to be observed by a friend. After 2 days he became confused and seemed very drowsy during the day. He was taken to the hospital, but died the same day. Look at the image showing the skull with the dura still attached to the skull; the brain and leptomeninges have been removed. What is the diagnosis and what was the source of the bleeding?