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FIG 3. Case 3: Absence of the right ICA.
A and B, Frontal (A) and lateral (B) projections from a left CCA arteriogram show an anomalous communication between the cavernous portions of the ICAs (arrow). This anomalous communication courses through the sella turcica. The right ACA is supplied via a patent ACOM, with the right A1 segment either being aplastic or extremely hypoplastic. The right MCA is a continuation of the right supraclinoid ICA.
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