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. 2015 May 19;84(20):2021–2028. doi: 10.1212/WNL.0000000000001591

Figure 1. Three MRI examples of BOSDs.

Figure 1

Coronal inversion recovery (A.a) and coronal T2-weighted (A.b) MRI scans at 3.0 tesla (T) showing a BOSD in the right circular sulcus in a 5-year-old girl with asymmetric tonic focal seizures. Coronal FLAIR (B.a) and sagittal FLAIR (B.b) MRI scans at 3.0T showing a BOSD in the right superior parietal lobule in a 17-year-old male with focal motor seizures. Coronal T2-weighted (C.a) and axial FLAIR (C.b) MRI scans at 1.5T showing a BOSD in the left superior frontal gyrus in a 35-year-old man with hypomotor focal seizures. Each example shows cortical thickening, blurred gray–white junction, and subcortical T2/FLAIR hyperintensity at the depth of the sulcus (thick arrow), with a “transmantle sign” extending through the deeper white matter and tapering to the ventricle (thin arrow). Resection of the BOSD identified focal cortical dysplasia type 2B pathology in each case. BOSD = bottom-of-sulcus dysplasia; FLAIR = fluid-attenuated inversion recovery.