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.
Features include :
- fourth ventricle communicating with the cyst
- cyst does not communicate with the cisterna magna posteriorly
- no vermian hypoplasia
- elevation of the tentorium
It needs to be distinguished from other causes of enlarged retro cerebellar "CSF" space.
- 1. Calabrò F, Arcuri T, Jinkins JR. Blake's pouch cyst: an entity within the Dandy-Walker continuum. Neuroradiology. 2000;42 (4): 290-5. Neuroradiology (link) - Pubmed citation
- 2. Epelman M, Daneman A, Blaser SI et-al. Differential diagnosis of intracranial cystic lesions at head US: correlation with CT and MR imaging. Radiographics. 26 (1): 173-96. doi:10.1148/rg.261055033 - Pubmed citation
Synonyms & Alternative Spellings
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|Blake’s pouch cyst||✗|
|Blake's pouch cyst||✗|