Table 2.

Proportion of etiological subgroups in CNP III, CNP IV, CNP VI, and multiple OMNP

Etiologies	CNP III ≈% (n = 147)	CNP IV ≈% (n = 71)	CNP VI ≈% (n = 210)	Multiple ≈% (n = 46)
Idiopathic	15.6% (23)	39.4% (28)	27.1% (57)	6.5% (3)
Diabetogenic	13.6% (20)	21.1% (15)	13.3% (28)	0
Space-occupying lesions thereof:	20.4% (30)	2.8% (2)	18.6% (39)	23.9% (11)
–Intraorbital	0.7% (1)	0	1.0% (2)	4.3% (2)
–Lesions close to the cavernous sinus	9.5% (14)	1.4% (1)	4.8% (10)	13.0% (6)
–Intracerebral, meningeal, intrathecal	10.2% (15)	1.4% (1)	12.9% (27)	6.5% (3)
Inflammation thereof:	27.2% (40)	25.4% (18)	30% (63)	67.4% (31)
–Autoimmune/inflammatory	22.4% (33)	19.7% (14)	23.8% (50)	54.3% (25)
–Viral, bacterial	4.8% (7)	5.6% (4)	6.2% (13)	13.0% (6)
Brainstem infarctions	19.7% (29)	9.9% (7)	7.1% (15)	2.2% (1)
Others	3.4% (5)	1.4% (1)	3.8% (8)	0