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. 2016 Oct;37(10):1774–1780. doi: 10.3174/ajnr.A4803

Fig 3.

Fig 3.

False-negative aneurysms in the 2 CTA protocols. A and B, An 80-kVp cerebral CTA with 30 mL of contrast agent in a 50-year-old man. A volume-rendered digital subtraction CTA image (A) shows 2 true-positive aneurysms in the anterior communicating artery and right middle cerebral artery, respectively (yellow arrows), while another 2 small aneurysms with diameters of 1.1 and 0.6 mm were found in the right middle cerebral artery (white arrows) on 3D-DSA (B), which were not found in the CTA image. C and D, A 120-kVp cerebral CTA with 60 mL of contrast agent in a 46-year-old man. The volume-rendered digital subtraction CTA image (C) shows a true-positive aneurysm in the left anterior choroidal artery (red arrow) and a false-negative aneurysm in the left posterior communicating artery (yellow arrow). The aneurysm in the left posterior communicating artery (yellow arrow) was found at repeat interpretation. 3D-DSA shows the 2 aneurysms (D).