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Table 1: 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.