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Click Sonographic imaging (GE Voluson 730 Expert, 3.5 MHz convex transducer) of a fetal brain at 18 weeks of gestation (normal male; 46, XY karyotype) with the diagnosis of bilateral subependymal heterotopia, ventriculomegaly and cerebellar asymmetry. Coronal and axial images show enlargement of both third and lateral ventricles.

Click Sonographic imaging (GE Voluson 730 Expert, 3.5 MHz convex transducer) of a fetal brain at 18 weeks of gestation (normal male; 46, XY karyotype) with the diagnosis of bilateral subependymal heterotopia, ventriculomegaly and cerebellar asymmetry. Coronal and axial images show enlargement of both third and lateral ventricles.

Click Fetal brain at 20 weeks of gestation (normal male 46, XY karyotype) with nodular subependymal heterotopia, ventriculomegaly and cerebellar abnormalities. Coronal T2-weighted half-Fourier acquisition single-shot turbo spin-echo (HASTE) MRI images (1.5 T Magnetic Resonance Imaging. Protocol: TR 1000 msec; TE 149 msec; thickness 3 mm; no contrast material) show enlargement of both third and lateral ventricles and a malrotated cerebellar vermis with a wide communication between fourth ventricle and cisterna magna. All the other parts of the cerebellum are normal and with regular margins. Note the presence of multiple, subcentimetric hypointense nodules of subependymal heterotopia along the walls of the frontal horns of the lateral ventricles.

Click Fetal brain at 20 weeks of gestation (normal male 46, XY karyotype) with nodular subependymal heterotopia, ventriculomegaly and cerebellar abnormalities. Coronal T2-weighted half-Fourier acquisition single-shot turbo spin-echo (HASTE) MRI images (1.5 T Magnetic Resonance Imaging. Protocol: TR 1000 msec; TE 149 msec; thickness 3 mm; no contrast material) show enlargement of both third and lateral ventricles and a malrotated cerebellar vermis with a wide communication between fourth ventricle and cisterna magna. All the other parts of the cerebellum are normal and with regular margins. Note the presence of multiple, subcentimetric hypointense nodules of subependymal heterotopia along the walls of the frontal horns of the lateral ventricles.