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Term of the day: Blake`s Pouch Cyst

Blake described a posterior evagination of the tela choroidea developing as a posterior expansion of the fourth ventricle in a normal 13 day old human embryo. This evagination represented a normal developmental stage and was associated with a normal vermis and had no communication with the perimedullary spaces. 

 The persistent Blake`s Pouch Cyst is a cystic malformation of the posterior fossa thought to derive from persistence and expansion of the normally transient Blake`pouch that arises from the area membranacea inferior (AMI) and that normally regresses during the fifth to eighth gestational weeks.  BPC represents a posterior balloning of the superior medullary vellum into the cisterna magna.

Term of the day: Blake`s Pouch Cyst Reviewed by Sumer Sethi on Sunday, November 17, 2013 Rating: 5

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