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PT  - JOURNAL ARTICLE
AU  - Cesaretti, C.
AU  - Nanni, M.
AU  - Ghi, T.
AU  - Parazzini, C.
AU  - Conte, G.
AU  - Contro, E.
AU  - Grisolia, G.
AU  - Righini, A.
TI  - Variability of Forebrain Commissures in Callosal Agenesis: A Prenatal MR Imaging Study
AID  - 10.3174/ajnr.A4570
DP  - 2016 Mar 01
TA  - American Journal of Neuroradiology
PG  - 521--527
VI  - 37
IP  - 3
4099  - http://www.ajnr.org/content/37/3/521.short
4100  - http://www.ajnr.org/content/37/3/521.full
SO  - Am. J. Neuroradiol.2016 Mar 01; 37
AB  - BACKGROUND AND PURPOSE: Agenesis of the corpus callosum, even when isolated, may be characterized by anatomic variability. The aim of this study was to describe the types of other forebrain commissures in a large cohort of randomly enrolled fetuses with apparently isolated agenesis of the corpus callosum at prenatal MR imaging.MATERIALS AND METHODS: All fetuses with apparent isolated agenesis of the corpus callosum undergoing prenatal MR imaging from 2004 to 2014, were evaluated for the presence of the anterior or a vestigial hippocampal commissure assessed in consensus by 2 pediatric neuroradiologists.RESULTS: Overall, 62 cases of agenesis of the corpus callosum were retrieved from our data base. In 3/62 fetuses (4.8%), no forebrain commissure was visible at prenatal MR imaging, 23/62 fetuses (37.1%) presented with only the anterior commissure, and 20/62 fetuses (32.3%) showed both the anterior commissure and a residual vestigial hippocampal commissure, whereas in the remaining 16/62 fetuses (25.8%), a hybrid structure merging a residual vestigial hippocampal commissure and a rudiment of the corpus callosum body was detectable. Postnatal MR imaging, when available, confirmed prenatal forebrain commissure findings.CONCLUSIONS: Most fetuses with apparent isolated agenesis of the corpus callosum showed at least 1 forebrain commissure at prenatal MR imaging, and approximately half of fetuses also had a second commissure: a vestigial hippocampal commissure or a hybrid made of a hippocampal commissure and a rudimentary corpus callosum body. Whether such variability is the result of different genotypes and whether it may have any impact on the long-term neurodevelopmental outcome remains to be assessed.ACanterior commissureACCagenesis of the corpus callosumCCcorpus callosumGAgestational ageHChippocampal commissureHShybrid structure