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Fig 1. Paraclinoid MR protocol in a control subject showing the 4 reference points. The 4 lines and their angles of intersection correlated with the limits of the distal dural ring plane in each cutting plane. A, B, C, Paraclinoid region in the diaphragmatic plane. D, E, F, Paraclinoid region in the carotid plane. DP indicates diaphragmatic point; CP, clinoid point; DL, diaphragmatic line; CL, clinoid line, ACNE, anterior CSF notch extremity; PCNE, posterior CSF notch extremity; OL, optic line; RL, roof line, DDRP, distal dural ring plane (dotted curve).
