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Pneumatisation symmetry types within the dorsum sellae (DS) and posterior clinoid process (PCP). A) PCP pneumatisation on the right side, B) PCP pneumatisation on the left side, C) DS pneumatisation, D) pneumatisation of both PCPs, E) pneumatisation of the DS and right PCP, F) pneumatisation of the DS and left PCP, G) pneumatisation of the DS and both PCPs; R – right, L – left
