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(A) bAVM of the posterior fossa with a compact nidus. (B) The nidus receives arterial supply by multiple arterial feeders «en-passage» (arrows). (C) Demonstration of the measurement of the diameter of the major arterial feeder at 1 cm from the nidus. (D) A prenidal aneurysm (arrow). (E) Presence of venous reflux into one of the cerebellar cortical veins draining the bAVM (arrow).
