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. 2018 Jul 19;60(9):945–960. doi: 10.1007/s00234-018-2056-7

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© The Author(s) 2018

Open Access This 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.

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Fig. 14 — Representation of the destructive theory of the formation of ‘reparative’ polymicrogyria. Coronal histology sections of the fetal brain at 17gw (a) have been reproduced after alteration with permission [24]. The red quadrilateral on a represents a focal, superficial injury to the cortical mantle, and resorption of the damaged brain is shown. Late neuro-glial migration in this case will produce polymicrogyria on the cortical surface. b iuMR images from a 9-week child which resulted from a monochorionic pregnancy complicated by twin-twin transfusion with survival of both twins. Axial T2-weighted and images from a T1 volume study and non-orthogonal along the course of the sylvian fissure show focal polymicrogyria in the abnormal posterior extension of the sylvian fissure (arrowed)