Extensive subarachnoid haemorrhage occupying the basal cisterns, right sylvian fissure, interhemispheric fissure, and the midline occipital and parietal lobe sulci. Grey-white matter differentiation is preserved, no evidence of definitive intraparenchymal haemorrhage. Small amount of blood in the posterior horn of the lateral ventricles and in the fourth ventricle. The temporal horns are slightly prominent in keeping with hydrocephalus. No midline shift or signs of brain herniation. The extracranial vessels, circle of Willis and vertebrobasilar system opacify normally with no aneurysm, vascular malformation, dissection or significant stenosis detected. Conventional aortic arch anatomy. The left vertebral artery is dominant.