BRAIN - Thrombosis of basilar and vertebral artery

The right vertebral artery is small in calibre and does not appear to show any atheroma. The left vertebral artery and basilar artery are tortuous and contain ante-mortem thrombus.
This man died at the age of 72, some four and a half hours after he became unconscious. He had a past history of hypertension and of a small stroke three years before.