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Table 1: Demographic data of patients presenting with subarachnoid or isolated intraventricular hemorrhage without a causative lesion on CTA
Total Men Women
No. of Patients 230 118 112
Mean age (yr) 54 55 54
Age range 19–92 21–92 19–87
SAH found by CT 216 106 110
SAH found by lumbar puncture 14 7 7
Mean time between CTA and DSA (days) 1.5 1.0 2.0
Time range between CTA and DSA (days) 0–110 0–5 0–110
Second follow-up study performed (No. of patients) 169 86 83
Mean time between initial and follow-up study (days) 33 24 42
Time range between initial and follow-up study (days) 0–1836 0–203 0–1836
Second follow-up modality 
    CTA 54 28 26
    DSA 98 45 53
    MRI/MRA 17 10 7

	Total	Men	Women
No. of Patients	230	118	112
Mean age (yr)	54	55	54
Age range	19–92	21–92	19–87
SAH found by CT	216	106	110
SAH found by lumbar puncture	14	7	7
Mean time between CTA and DSA (days)	1.5	1.0	2.0
Time range between CTA and DSA (days)	0–110	0–5	0–110
Second follow-up study performed (No. of patients)	169	86	83
Mean time between initial and follow-up study (days)	33	24	42
Time range between initial and follow-up study (days)	0–1836	0–203	0–1836
Second follow-up modality
CTA	54	28	26
DSA	98	45	53
MRI/MRA	17	10	7