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We report our findings associated with the differential diagnosis of infundibular dilation (ID) versus a small intracranial aneurysm using three-dimensional rotational angiography with volume rendering (3DRA+VR).Angiographic findings associated with IDs found via two-dimensional digital subtraction angiography (2D-DSA) or 3DRA+VR were reviewed for 138 consecutive patients with known or suspected aneurysms.Two readers independently evaluated the results of 2D-DSA and 3DRA+VR according to the same diagnostic criteria.We also evaluated the ability of 3D-DSA to show the spatial relation between IDs and anterior choroidal (AchA)/ posterior communicating (PcomA) arteries.