Table 1:

Patient demographics and clinical characteristics

	CT Angiography	Contrast-Enhanced MR Imaging, Brain	Contrast-Enhanced MR Imaging, IAC	Total
No. of patients	228	304	266	798
No. of males (%)	106 (47)	115 (38)	98 (37)	319 (40)
Age (yr) (mean) (range)	56 (19–90)	55 (15–90)	54 (6–93)	55 (6–93)
Emergency setting (%)	191 (84)	63 (21)	3 (1)	257 (32)
Diagnostic efficacy	5 (2.2%)	4 (1.3%)	4 (1.5%)	13 (1.6%)
Therapeutic efficacy	3 (1.3%)	2 (0.7%)	3 (1.1%)	8 (1.0%)

Note:—IAC indicates internal auditory canal.