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Patient 20: inferior vermian hypogenesis (23 weeks' gestation).
A, Axial ssFSE image (∞/98/0.5) shows the normal superior vermis (arrow).
B, Subjacent section shows CSF communication with the fourth ventricle (arrow).
C, Midline sagittal image shows hypogenetic inferior vermis with normal superior and hypoplastic inferior lobules (arrow).
