The Egyptian Journal of Otolaryngology

Table 2 Distribution of the study group according to the site of the lesion based on the VNG test

From: Vestibular findings in patients with white matter disease

VNG test results			No.	%
Normal VNG study			12	40
Abnormal VNG	^aPeripheral vestibular lesion	BPPV	2	6.7
		Positional (peripheral)	6	20
		Unilateral caloric weakness	3	10
	^bNon-localizing positional criteria		4	13.3
	^cMixed vestibular lesion		3	10
Total patient in the study group			30	100

^aPeripheral vestibular lesion based on the positioning (Dix-Hallpike), peripheral criteria of positional nystagmus as the only finding, and unilateral caloric weakness
^bNon-localizing vestibular lesion based on the presence of positional nystagmus as the only VNG finding with the criteria of positional nystagmus not clearly matching a peripheral or central site of lesion (vertical nystagmus, abolished or diminished with fixation with a minimal subjective sense of dizziness)
^cMixed criteria of the vestibular lesion based on the presence of multiple VNG findings including BPPV together with spontaneous nystagmus (2 patients) and/or positional nystagmus of mixed criteria (peripheral and central) as mentioned above. One of the patients had unilateral caloric weakness in addition to the positioning, positional, and spontaneous nystagmus

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