Figure 2: On the left side both arrows show compression of the chiasm and left optic nerve by the dolichoectatic artery in the T2-weighted (above) and T1-weighted (below) MRI in coronal plane. On the right side the angiogram of the asymmetric internal carotid (above) giving rise to an ectatic and elongated left supraclinoid internal carotid artery and the absence of the right A1 segment (below, marked by *).