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Anomalous origin of the posterior inferior cerebellar artery from the posterior meningeal artery.

The posterior inferior cerebellar artery (PICA) usually originates from the distal vertebral artery . Many variations in its origin and course have been observed in association with anomalies of the anterior inferior cerebellar artery (AICA) (1 ). However, as far as we know, angiographic evidence of anomalous origin of the PICA from the posterior meningeal artery (PMA) has not been reported previously. This last anomaly is interesting with regard to the embryologic development of the PICA and the PMA.