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a. Coronal proton density image showing hypertrophied right posterior communicating artery (white arrowhead) and nonvisualized ICA on the right side (white arrow). b. MRA showing ICA only on the left side (white arrow) with AVM corresponding to the parietal area (white arrowhead)

a. Coronal proton density image showing hypertrophied
right posterior communicating artery (white arrowhead) and
nonvisualized ICA on the right side (white arrow). b. MRA showing ICA only on the left side (white arrow) with AVM corresponding to the parietal area (white arrowhead)