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{{multiple image
| direction = horizontal
| width = 200
| footer = Figure 5D: This patient had subarachnoid hemorrhage on non-contrast CT scan. Images D1, D2,
D3 are 3-D reconstructions from CTA (to identify source of hemorrhage) which show aneurysm
like pouching (red arrows) in the PCOM (2) and ACOM (3,4). On conventional angiography (1),
these aneurysms were proved to be the infundibulum of vessels. The diagnosis of aneurysms <3
mm on CTA is often tenuous and requires angiographic confirmation.<ref name=Mirza2016/>
| image1 = Volume rendered CT angiography of posterior communicating artery aneurysm.png
| alt1 =
| caption1 =
| image2 = Volume rendered CT angiography of subtle anterior communicating artery aneurysm.png
| alt2 =
| caption2 = }}
→Computed tomography angiography (CTA): Formatting
File:CT angiography of a vascular malformation with intraventricular hemorrhage.png|Figure 5A: Sagital reformatted images from CT angiogram identify an enhancing vascular malformation (arrow), which was the etiology of the intraventricular hemorrhage.<ref name=Mirza2016/>
File:CT angiography of basilar tip aneurysm.png|Figure 5B: Computed tomography angiogram in the axial projection demonstrates a focal basilar tip artery aneurysm (arrow).<ref name=Mirza2016/>
File:Volume rendered CT angiography of anterior communicating artery aneurysm.png|Figure 5C: [[Volume rendering]] of cerebal computed tomography angiogram (CTA) with
skull surface overlay demonstrates an anterior communicating artery aneurysm (1). Dedicated images from CTA of the Circle of Willis isolate the aneurysm (arrow) (2).<ref name=Mirza2016/>
File:Volume rendered CT angiography of posterior communicating artery aneurysm.png|Figure 5D: This patient had subarachnoid hemorrhage on non-contrast CT scan. Left image is a maximum intensity projection and right is a volume rendering CTA (to identify source of hemorrhage) which show aneurysm like pouching (red arrows) in the PCOM (2).<ref name=Mirza2016/>
File:Volume rendered CT angiography of subtle anterior communicating artery aneurysm.png|Two more volume renderings of the same case, also showing an aneurysm-like pouching in the ACOM. On conventional angiography, these aneurysms were proved to be the infundibulum of vessels. The diagnosis of aneurysms <3 mm on CTA is often tenuous and requires angiographic confirmation.<ref name=Mirza2016/>
</gallery>
CTA Source Images: CTA SI using the images in a CTA, cerebral perfusion can be assessed as
