• Grade I: hemorrhage limited to the germinal matrix (subependymal hemorrhage)
• Grade II: hemorrhage which has extended into the ventricular system but without dilation of the lateral ventricles.
• Grade III: hemorrhage extending into the ventricular system with the blood resulting in ventricular dilatation.
• Grade IV: hemorrhage which extends into the brain tissue (this grade is also referred to as PVH and associated with intraparenchymal echodensity (IPE) by some).