TPP1 and cerebral cortical dysplasia: The remaining abnormal MRI findings included abnormal cortical signals (mt-DNA n = 2), reduced white matter volume (SCN1A n = 1), right anterior cingulate gyrus cortical dysplasia (MFSD8 n = 1), and abnormal signals in the right frontotemporal lobe (TPP1 n = 1), all of which were found on the first MRI.