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FIG 4. Sonograms obtained in a neonate with a presumptive diagnosis of posterior fossa malformation at prenatal sonography.
A, AF midline sagittal view shows a cystic image (asterisk) in the posterior fossa behind the cerebellum.
B, PF midline sagittal view clearly demonstrates that the lesion corresponds to a megacisterna magna, depicting the normal-sized cerebellum vermis and fourth ventricle. Note that the cystic lesion (asterisk) extends around the cerebellum without compressing it, as often occurs with arachnoid cysts.
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