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. 2018 Apr 13;13:57. doi: 10.1186/s13023-018-0794-6

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Basilar artery (BA) and the outlet angle of the superior cerebellar artery (SUCA) Assessment of the BA length and bifurcation height and SUCA outlet angle. a) A 57 year old male control patient with normal height of the BA bifurcation (grade 0 according to Smoker criteria [8]) and nearly perpendicular SUCA outlet from the basilar artery (angle right: 85°, angle left: 75°; SUCA outlet angle of 160° as defined by sum of left and right side). b) A 61 year old female LOPD patient with dilated basilar artery, cranial shifted BA bifurcation indenting the third ventricle and hypothalamus (*, grade 3 according to Smoker’s criteria [8]) and low SUCA outlet angle (angle right: 48°, angle left: 31°; SUCA outlet angle of 79° as defined by sum of left and right side). Schematic drawings indicate measurements of SUCA outlet angles (red angles) and measurements of basilar artery: anatomic length (line a) and linear length (line b)