Sangre difusa fina, < 1 mm en cisternas verticales.
III
Coágulos localizados y/o sangre >1 mm en cisternas verticales.
IV
Coagulo intracerebral o intraventricular con HSA difusa o sin ella.
Relation of cerebral vasospasm to subarachnoid hemorrhage visualized by computerized tomographic scanning.
Fisher CM, Kistler JP, Davis JM.Neurosurgery. 1980 Jan;6(1):1-9.