Grade 1 = normal CT scan (9.6% mortality)
Grade 2 = cisterns present, shift < 5mm (13.5% mortality)
Grade 3 = Cistern compressed/ absent, shift <5mm (34% mortality)
Grade 4 = Shift > 5mm (56.2% mortality)
Marshall LF, Bowers-Marshall S, Klauber MR et al. A new classification of head injury based on computerized tomography. J Nuerosurg 75(Suppl):S14-20, 1991
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