Table 5.

WM abnormality classifications

UCSF Classification	MR Findings
Normal	No periventricular WM signal abnormalities
Minimal WMI	3 or fewer areas of T1 signal abnormality of <2 mm
Moderate WMI	3 or more areas, or areas measure >2 mm but <5% of hemisphere
Severe WMI	T1 abnormalities with >5% of hemisphere involved
Mild / Borderline ventriculomegaly	Ventricular diameter at level of glomus of choroid plexus = 8–10 mm
Mod / Severe ventriculomegaly	Ventricular diameter >10mm

Excellent agreement between readers: 89.5%, kappa = 0.84

Miller SJ, et. al. AJNR 2003; 24:1661–69; Glass HC, et. al. Pediatrics 2008;122:229–305