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 |