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FIG 4. Case 4: Aplasia of the left ICA.
A, Frontal view from a right CCA arteriogram shows collateral flow to the left ACA across a patent ACOM (arrow).
B, Frontal view from a left vertebral arteriogram displays collateral flow to the left MCA (arrow) via forward flow through a patent PCOM (arrowhead).
C, Axial CT scan through the skull base reveals a diminutive left carotid canal (arrow).
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