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Table 1: MRI criteria for assignment of brain volume scores
BVS Brief Description Features
1 Severe atrophy Markedly atypical for age with diffuse prominence of the cisternae, ventricles, and sulci
2 Mild atrophy Subtle prominence of the cisternae, ventricles, and sulci for age
3 Normal Typical for age
4 Mild increased volume Mildly increased brain volume for age, but with normal cisternae, ventricles, and sulci
5 Mild swelling Some localized or regional loss of cisternae, ventricles, and sulci
6 Moderate swelling Diffuse involvement with incomplete effacement of the cisternae, ventricles, and sulci
6.5^{^a} Moderate-to-severe swelling Features between 6 and 7, eg, near-complete effacement of the sulci without cisternal/ventricular effacement or significant cisternal/ventricular effacement with partial loss of the sulci
7 Severe swelling Loss of all sulci with cisternal and ventricular effacement and decreased gray/white matter delineation
8 Severe swelling with herniation Loss of all sulci with cisternal and ventricular effacement with herniation
↵a Score of 6.5 was not included in the original BVS.