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A : Intraoperative photographs showing the constriction of the greater occipital nerve in its perforation site of the semispinaliscapitis muscle. B : A photograph showing no constriction along the peripheral course of the greater occipital nerve proximal to the semispinalis to the C2, 3 facet. C : An intraoperative photograph showing no vascular contact between the C1, 2 nerve roots and the posterior inferior cerebellar artery.
