Characteristics of false-positive (n = 2) and false-negative (n = 10) evaluations
| Location | Size (mm) | Reader | Confidence | Main Reason for Results |
|---|---|---|---|---|
| False-negative | ||||
| Supraclinoid ICA | 1.5 | 1 and 2 | 2, 1 | Very small, close proximity to bone |
| Supraclinoid ICA | 1.8 | 1 and 2 | 3, 2 | Very small, close proximity to bone |
| Supraclinoid ICA | 1.8 | 2 | 2 | Very small |
| PcomA | 1.5 | 1 and 2 | 2, 2 | Very small, prominent infundibulum |
| PcomA | 2.1 | 1 and 2 | 3, 3 | Very small, prominent infundibulum |
| PcomA | 2.8 | 1 | 3 | Prominent infundibulum |
| MCA bifurcation | 2.5 | 1 | 2 | Obscured by overlapping vessels |
| MCA bifurcation | 2.8 | 2 | 3 | Obscured by overlapping vessels |
| A1 | 2.8 | 1 | 1 | Unusual location |
| Basilar tip | 3.9 | 2 | 1 | Atypical configuration, kissing aneurysm |
| False-positive | ||||
| PcomA | 1.9 | 2 | 4 | Prominent infundibulum |
| PcomA | 1.5 | 1 | 4 | Prominent infundibulum |
Note:–ICA indicates internal carotid artery; PcomA, posterior communicating artery; MCA, middle cerebral artery; A1, first segment of anterior cerebral artery. Confidence score refers to a 5-point scale of reader certainty in identifying the presence or absence of the aneurysms (1 = definitely not present; 2 = probably not present; 3 = equivocal; 4 = probably present; 5 = definitely present).