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Blake pouch cyst

A Blake pouch cyst represents posterior ballooning of the superior medullary velum into the cisterna magna, below and posterior to the vermis. It is thought to be secondary to failure of perforation of the foramen of Magendie. Some authors class this malformation as part of the Dandy-Walker continuum.

Radiographic features

General

Features include :

Differential diagnosis

It needs to be distinguished from other causes of enlarged retro cerebellar "CSF" space.

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