Abstract

sinus, the Torcula Herophili, dural folds of the inferior attachments of the falx cerebelli, or bridging arachnoid septations. Through improved knowledge of posterior fossa embryology, anatomy and malformations and our own observations in fetuses and neonates, we believe that these septa represent a remnant of Blake’s pouch, a normal dorsal extension of the developing 4th ventricle. We also demonstrate the probable relationship between these septa, the Dandy-Walker continuum, mega cisterna magna and Blake’s pouch cyst. Results: Observations that we will demonstrate on fetal and neonatal cranial sonography include:

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