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