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| Type | Types of abnormalities on CT scanning |
|---|---|
| I | No visible pathological condition on CT scan |
| II | Cisterns present with midline shift 0‒5 mm; no lesion >25 mL |
| III | Cisterns compressed or absent with midline shift 0‒5 mm; no lesion >25 mL |
| IV | Midline shift >5 mm; no lesion >25 mL |
| V | Any lesion surgically evacuated |
| VI | Lesion >25 mL not surgically evacuated |
CT: computed tomography; MRI: magnetic resonance imaging; CT: computed tomography.
