Diagnostic performance of CTA according to aneurysm location in subgroups*
| Location | Sensitivity | Specificity | PPV | NPV |
|---|---|---|---|---|
| Anterior cerebral artery | 0.97 (35/36) | 1.00 (81/81) | 1.00 (35/35) | 0.99 (81/82) |
| 95% CI | 0.81–0.99 | 0.95–1.00 | 0.88–1.00 | 0.93–1.00 |
| ICA | 0.81 (25/31) | 0.97 (83/86) | 0.89 (25/28) | 0.93 (83/89) |
| 95% CI | 0.63–0.91 | 0.90–0.99 | 0.72–0.97 | 0.86–0,97 |
| MCA | 0.90 (28/31) | 1.00 (86/86) | 1.00 (28/28) | 0.97 (86/89) |
| 95% CI | 0.74–0.97 | 0.95–1.00 | 0.86–1.00 | 0.90–0.99 |
| Posterior circulation | 0.95 (18/19) | 1.00 (98/98) | 1.00 (18/18) | 0.99 (98/99) |
| 95% CI | 0.74–1.00 | 0.95–1.00 | 0.79–1.00 | 0.94–1.00 |
* Numbers between parentheses are aneurysms.