Extradural Posterior Inferior Cerebellar Artery and Foramen Magnum Meningioma: Case Report

1.1. Background
Being parts of the cranio-cervical junction´s crucial anatomical structures, the vertebral artery and the posterior inferior cerebellar artery (PICA) relationships, location and trajectories must be meticulously studied when dealing with foramen magnum tumors, including the possible detection of an unusual C1-C2 extradural origin of PICA.

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