Fig 2.

Anomalous course and/or origin. A, 3D rendering from MRA shows elongation of the right PcomA, an anomalous connection between the right P1 segment and the right MCA (red arrow). The right ICA and left PCA are also diffusely narrow (white arrow), and the right A1 segment is hypoplastic (white asterisk). B, 3D rendering from CTA shows the tortuous looped course of the supraclinoid right ICA (white arrow). Note also the presence of 2 ACAs, a separate artery of the corpus callosum, and aneurysms at the right carotid terminus and distal right A1 segment (white asterisks). Volume renderings were generated by using OsiriX.³²