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Subtracted 3D CT Angiography for Evaluation of Internal Carotid Artery Aneurysms: Comparison with Conventional Digital Subtraction Angiography

S. Sakamoto, Y. Kiura, M. Shibukawa, S. Ohba, K. Arita and K. Kurisu

From the Department of Neurosurgery, Hiroshima University Graduate School of Biomedical Sciences, Hiroshima, Japan


Figure 1
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  		Fig. 1. Case 11: Patient with 3 ophthalmic artery (OphA), 1 carotid cave, and 1 cavernous aneurysm. A, Intraarterial angiogram, oblique view, showing the right OphA aneurysm (long arrow) and the right carotid cave aneurysm (short arrow).

B, Intraarterial angiogram, lateral view, showing the right OphA aneurysm (long arrow), the right carotid cave aneurysm (arrowhead), and the right cavernous aneurysm (short arrow).

C, Multiplanar reformatted (MPR) image, sagittal view, showing the right OphA aneurysm (long arrow) and OphA branching at the aneurysm neck (short arrow).

D, MPR image, sagittal view, which did not clearly visualize the right cavernous aneurysm.

E, MPR image, sagittal view, which did not clearly visualize the right carotid cave aneurysm.

F, Nonsubtracted (NS) 3D computed tomographic angiography (3DCTA), superior view, showing the right OphA aneurysm (arrow), but the right carotid cave and cavernous aneurysms were not visualized.

G, Volume-subtracted (VS)-3DCTA, superior view, clearly showing the right OphA (long arrow) and the right cavernous aneurysm (short arrow).

H, VS-3DCTA, oblique view, clearly showing the right OphA aneurysm (long arrow), the right carotid cave aneurysm (short arrow), the right cavernous aneurysm (double arrows), and OphA branching at aneurysm neck (arrowhead).


Figure 2
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  		Fig. 2. Case 8: Patient with 1 carotid cave aneurysm and infundibular widening of the posterior communicating artery (PcomA).

A, Intraarterial angiogram, anteroposterior view, showing the left carotid cave aneurysm in the inferomedial direction (arrow).

B, Nonsubtracted (NS) 3D computed tomographic angiography (3DCTA), anteroposterior view, which did not show the left carotid cave aneurysm.

C, Volume subtraction (VS)-3DCTA, anteroposterior view, clearly showing the left carotid cave aneurysm with inferomedial direction (arrow).

D, Intra-arterial angiogram, lateral view, showing an infundibular widening (long arrow) of the left PcomA and a PcomA (short arrow) originating from the top of the infundibular widening.

E, VS-3DCTA, medial view, showing the left carotid cave aneurysm in the inferomedial direction (arrow) and the PcomA (arrowhead) originating from the top of the infundibular widening.

F, NS-3DCTA, posterior view, showing the infundibular widening of the left PcomA and the PcomA (arrow) originating from the top of the infundibular widening.


Figure 3
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  		Fig. 3. Case 20: Patient with 1 anterior choroidal artery (AchoA) aneurysm. A, Intra-arterial angiogram, lateral view, showing the left AchoA aneurysm (long arrow) originating at the junction of the AchoA (short arrows) and the internal carotid artery (ICA).

B, Multiplanar reformatted (MPR) image, sagittal view, showing the left AchoA aneurysm (arrow).

C, MPR image, sagittal view, showing AchoA branching at aneurysm neck (arrows).

D, Volume subtracted (VS)-3D computed tomographic angiography (3DCTA), lateral view, showing the left AchoA aneurysm (arrow).

E, VS-3DCTA, posterior view, showing the left AchoA aneurysm with a posterolateral direction (arrow).

F, VS-3DCTA, medial view, clearly showing the left AchoA aneurysm (long arrow) and AchoA branching at the aneurysm neck (short arrows).





Copyright © 2008 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X