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UOC di Radiologia e Neuroradiologia Pediatrica, Ospedale dei Bambini V. Buzzi , Milan, Italy and UOC di Neuroradiologia- IRCCS Fondazione Policlinico-Mangiagalli Milan, Italy.<i>The cases from Milan were recruited as clinical cases with ethical approval for retrospective review of clinical notes and MR images by the \u201cMilano Area B\u201d and \u201cMilano Area C\u201d Ethics Committees, without the need for specific consent from patients (n. 2292\/2016 and n. 1394\/2015 protocol approval codes respectively).<\/i>B. UOC di Neuroradiologia -IRCCS Gaslini Research Children\u2019s Hospital Genoa, Italy.<i>Local Ethical Committee approval code number 533REG2015.<\/i>C. UOC di Neuroradiologia - Spedali Civili di Brescia, Italy, UOC di Neuroradiologia - Azienda Ospedaliera Padovana Padua, Italy, and UOC di Neurologia Pediatrica - IRCCS Ospedale Pediatrico Meyer Firenze, Italy.<i>For the cases from Brescia, Padua, and Florence (the three centres which provided the minority of cases) the consent form was waived since this was a retrospective analysis of routinely collected anonymized data performed blindly.<\/i>D. Academic Unit of Radiology, University of Sheffield, UK.<i>Most of the women from this centre were recruited from on-going research studies over the recruitment time period and provided informed written consent under the guidance and approval of the Institutional Research Ethics Committee. Those women were not paid for their involvement in the study but travel expenses were offered for themselves and a companion. Relevant review was sought, and approval obtained, from the Institutional Clinical Effectiveness Unit and Research Department in order to allow those cases performed for clinical purposes to be reported in this paper.<\/i>","order":6,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"<b>Statement concerning overlapping content<\/b>During the study reported in <i>ref.<\/i>, we noticed a cluster of fetuses with unilateral CFA and ACC. We have focused on fetuses with complete ACC and unilateral CFA in this study in order to provide a detailed morphological analysis to define the imaging characteristics of such fetuses.<i>Righini A, Genovese M, Parazzini C, et al Cortical formation abnormalities on fetal MR imaging in utero: A proposed classification system trialled on 356 cases from Italian and UK centres. Eur Radiol 2020; 30:5250-5260<\/i>","order":7,"name":"Ethics","group":{"name":"EthicsHeading","label":"Study subjects or cohorts overlap"}},{"value":"\u2022 retrospective\u2022 cross-sectional study\u2022 multicentre study","order":8,"name":"Ethics","group":{"name":"EthicsHeading","label":"Methodology"}}]}}