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TABLE 3: Distribution of optic nerve enhancement by final diagnosis
Final Diagnosis Optic Nerve Enhancement (%) Average Extent of Enhancement (mm ± SD) Optic Nerve Edema and Enhancement (%) Optic Nerve Edema without Enhancement (%) White Matter Lesions and Optic Nerve Enhancement (%)
Idiopathic optic neuropathy 21/42 19.6 ± 9.3 21/21 5/42 12/21
(50.0) (100) (11.9) (57)
Ischemic optic neuropathy 2/18 21.5 ± 18.5 1/2 2/18 1/2
(11.1) (50) (11.1) (50)
Optic neuropathy related to cat scratch disease 5/9 3.58 ± 0.48 0/5 0/9 0/5
(55.6) (0) (0) (0)
Optic neuropathy to multiple sclerosis 6/9 17.95 ± 9.9 5/6 0/9 4/6
(66.7) (83.3) (0) (66.7)
Others 3/4 10.7 ± 9.8 3/3 1/4 1/4
(75) (100) (25) (25)

Final Diagnosis	Optic Nerve Enhancement (%)	Average Extent of Enhancement (mm ± SD)	Optic Nerve Edema and Enhancement (%)	Optic Nerve Edema without Enhancement (%)	White Matter Lesions and Optic Nerve Enhancement (%)
Idiopathic optic neuropathy	21/42	19.6 ± 9.3	21/21	5/42	12/21
	(50.0)		(100)	(11.9)	(57)
Ischemic optic neuropathy	2/18	21.5 ± 18.5	1/2	2/18	1/2
	(11.1)		(50)	(11.1)	(50)
Optic neuropathy related to cat scratch disease	5/9	3.58 ± 0.48	0/5	0/9	0/5
	(55.6)		(0)	(0)	(0)
Optic neuropathy to multiple sclerosis	6/9	17.95 ± 9.9	5/6	0/9	4/6
	(66.7)		(83.3)	(0)	(66.7)
Others	3/4	10.7 ± 9.8	3/3	1/4	1/4
	(75)		(100)	(25)	(25)