TABLE 2:

Comparisons of perfusion measures (cerebral blood flow, cerebral blood volume, and mean transit time) in patients with multiple sclerosis of each lesion type with their contralateral normal-appearing white matter

Lesion Type	Cerebral Blood Flow (P)	Cerebral Blood Volume (P)	Mean Transit Time (P)
Enhancing	.007	<.0001	.99
Nonenhancing: class 1	<.0001	.0001	<.0001
Nonenhancing: class 2	.16	.02	.12

Enhancing indicates enhancing lesions; nonenhancing: class 1, nonenhancing lesions with decreased perfusion and perfusion measures dissimilar to those of enhancing lesions; nonenhancing: class 2, nonenhancing lesions with increased perfusion and perfusion measures similar to those of enhancing lesions.