Table 2.

MRI characteristics of the PE and NE groups

	PE group (n = 21)	NE group (n = 20)	p
Optic nerve
Unilateral, n (%)	0	2 (10.0)	0.333
Optic chiasm, n (%)	1 (4.8)	0
Spinal cord
Cervical, n (%)	7 (33.3)	8 (40.0)	0.426
Cervical–thoracic, n (%)	6 (28.6)	2 (10.0)
Thoracolumbar, n (%)	4 (19.0)	3 (15.0)
Cerebral
Periventricular white matter, n (%)	1 (4.8)	1 (5.0)	1.000
Cortex and subcortical white matter, n (%)	1 (4.8)	1 (5.0)
Brainstem
Area postrema, n (%)	2 (9.5)	3 (15.0)	1.000
Pontine, n (%)	1 (4.75)	3 (15.0)

PE = persistent enhancement; NE = no enhancement.