Aneurysm detection by MSCTA, confirmation by DSA/3DRA, and locations
| Aneurysm Size, mm | CTA: No. of Aneurysms* | DSA: No. of CTA True-Positives | DSA: No. of CTA False-Negatives | DSA: No. of CTA False-Positives | Aneurysm Locations (No.) of Each Size Range as on DSA |
|---|---|---|---|---|---|
| <4 | 15 | 13 | 1 | 0 | AcomA (1) |
| ACA: A1/A2 Bif (2) | |||||
| ICA: cavernous (1) | |||||
| ICA: periophthalmic (2) | |||||
| ICA: PcomA segment/origin (3) | |||||
| MCA: Bif/Trif (2) | |||||
| MCA: M2 segment (2) | |||||
| 4–10 | 20 | 18 | 0 | 1 | AcomA (4) |
| ICA: PcomA segment/origin (7) | |||||
| ICA: terminus (1) | |||||
| MCA: Bif/Trif (4) | |||||
| Basilar: tip (1) | |||||
| Basilar: midportion (1) | |||||
| >10 | 6 | 6 | 0 | 0 | AcomA (2) |
| ICA: periophthalmic (1) | |||||
| ICA: PcomA segment/origin (1) | |||||
| ICA: terminus (1) | |||||
| MCA: Bif/Trif (1) | |||||
| Total | 41 | 37 | 1 | 1 | AcomA (7) |
| ACA: A1/A2 Bif (2) | |||||
| ICA: cavernous (1) | |||||
| ICA: periophthalmic (3) | |||||
| ICA: PcomA segment/origin (11) | |||||
| ICA: terminus (2) | |||||
| MCA: Bif/Trif (7) | |||||
| MCA: M2 segment (2) | |||||
| Basilar: (2) |
Note:—PcomA indicates posterior communicating artery; AcomA, anterior communicating artery; Bif/Trif, bifurcation/trifurcation; ICA, internal carotid artery; MSCTA, multisection CT angiography; DSA, digital subtraction angiography; 3DRA, 3D rotational angiography; CTA, CT angiography; ACA, anterior cerebral artery.
* Note: Number of aneurysms on CTA includes 2 patients with aneurysms who did not undergo DSA/3DRA.