Clinical features, neurologic status, and CT features on admissiona
| Total | T1-FLAIR Mismatch | P Value | ||
|---|---|---|---|---|
| Positive | Negative | |||
| No. of patients | 127 | 43 (33.9) | 84 (66.1) | |
| Warning sign | ||||
| Positive | 14 | 13 (30.2) | 1 (1.2) | <.001 |
| Negative | 54 | 2 (4.7) | 52 (61.9) | |
| Unknown | 59 | 28 (65.1) | 31 (36.9) | |
| Mean age (yr) | 61.5 ± 14.2 | 66.5 ± 13.2 | 58.9 ± 14.0 | .004 |
| Age range (yr) | 21–89 | 40–85 | 21–89 | |
| Elderly patients | ||||
| Older than 80 years | 12 | 10 (23.3) | 2 (2.4) | <.001 |
| Female sex | 89 | 32 (74.4) | 57 (67.9) | .541 |
| Rebleeding after admission | 28 | 19 (44.2) | 9 (1.7) | <.001 |
| WFNS grade on admission | ||||
| Grades I–II | 97 | 28 (65.1) | 69 (82.1) | .028 |
| Grades IV–V | 28 | 13 (30.2) | 15 (17.9) | .120 |
| Fisher group | ||||
| Group 3 | 85 | 30 (69.8) | 55 (65.5) | .550 |
| Intracerebral hemorrhage | 25 | 19 (44.2) | 6 (7.1) | <.001 |
| Acute hydrocephalus | 61 | 26 (60.5) | 35 (41.7) | .060 |
| Aneurysm site | ||||
| Anterior communicating artery | 41 | 9 (20.9) | 32 (38.1) | |
| Anterior cerebral artery | 8 | 4 (9.3) | 4 (4.8) | |
| Internal carotid artery | 38 | 12 (27.9) | 26 (31.0) | |
| Middle cerebral artery | 31 | 17 (39.5) | 14 (16.7) | |
| Posterior circulation | 8 | 0 | 8 (9.5) | .051 |
| Aneurysm size | ||||
| >5 mm | 75 | 31 (72.1) | 44 (52.4) | .037 |
| >10 mm | 8 | 3 (7.0) | 5 (6.0) | 1.000 |
Note:—WFNS indicates World Federation of Neurological Surgeons.
↵a Values are No. (%) unless otherwise stated. The “No. of patients” row shows the percentage of the total number of patients, whereas all other percentages in the “Positive” and “Negative” columns are the percentages of patients with positive and negative findings, respectively.