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A and B, Coronal and sagittal single-shot-FSE T2-weighted sections of a 33 weeks' GA fetus show bilateral increased volume/abnormal persistence of the GE (arrows). Macrocephaly (>97th centile) and mild ventriculomegaly (<12 mm) are also noted. An activating mutation of MTOR gene was identified. C and D, A GA-matched control.
