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Fig 3. A, Axial SS-FSE T2-weighted image in a 19-gestational-week-old fetus referred for callosal agenesis demonstrates thinning of the right frontal parenchyma with several abnormal infoldings of the developing cortex (arrow) consistent with polymicrogyria.
B, Coronal SS-FSE T2-weighted image confirms multiple abnormal cortical infoldings (black arrow) and also demonstrates several areas of nodularity (white arrow) along the dilated right frontal horn consistent with periventricular nodular heterotopia. Microphthalmia of the right globe (arrowhead) is also present.
C, Axial SS-FSE T2-weighted image demonstrates abnormal morphology of the fourth ventricle with small, dysgenetic cerebellar hemispheres bilaterally. This constellation of findings led to the prenatal diagnosis of Aicardi syndrome.
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