Table 1:
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).