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Fig. 3A —54-year-old woman with normal intracranial arteries. Examples of
visualization of anterior choroidal artery with 2D CT angiography and digital
subtraction angiography but not with 3D CT angiography. Three-dimensional CT
angiogram in superior oblique projection shows right internal carotid artery
(thick arrow), right A1 segment of anterior cerebral artery (thin
arrow), posterior communicating artery (arrowhead), and expected
location (curved arrow) of anterior choroidal artery, which is not
visible despite extensive adjustments of window and level settings.
