RT Journal Article SR Electronic T1 The Use of In Utero MR Imaging to Delineate Developmental Brain Abnormalities in Multifetal Pregnancies JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A2762 A1 P.D. Griffiths A1 S.A. Russell A1 G. Mason A1 J. Morris A1 E. Fanou A1 M.J. Reeves YR 2011 UL http://www.ajnr.org/content/early/2011/11/17/ajnr.A2762.abstract AB BACKGROUND AND PURPOSE: iuMR has been shown to increase the detection rate of developmental abnormalities of the CNS, though most reports are limited to singleton pregnancies. The hypothesis tested in this study was that iuMR performed in multifetal pregnancies will show additional information about fetal CNS abnormalities in a similar proportion of cases when compared with singleton pregnancies. MATERIALS AND METHODS: Fifty women with multifetal pregnancies were recruited consecutively carrying at least 1 fetus with a suspected developmental fetal CNS abnormality on sonography. All had iuMR at the same center by using the same MR imaging protocol. When the sonography and MR imaging reports were discrepant, 1 fetomaternal expert assessed the reports independently to predict in what percentage a change in prognosis/counseling would have occurred if iuMR was included in the diagnostic pathway. RESULTS: There was agreement between the sonography and iuMR reports in 66% and disagreement in 34% of cases. The major cause for discrepancy was the presence or absence of the corpus callosum, which accounted for 10/17 of the disagreements. In 12/17 of the discrepant cases, the effect on management was judged to be significant. CONCLUSIONS: We conclude that iuMR has a similar rate of discrepancy to sonography in multifetal pregnancies compared with the published data concerning singleton pregnancies. Our analysis of the effect on management shows that changes in the decision to consider termination of pregnancy would have occurred in 12/17 of the discrepant cases (ie, in 24% of our cases overall). Abbreviations ACCagenesis (or severe hypogenesis) of the corpus callosumiuMRin utero MR imagingVMventriculomegaly, subclassified as mild, moderate, or severe