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Start free with EleplanBlake pouch cyst
ORPHA:98922Morphological anomaly
What it is
Blake pouch cyst is a non-syndromic, usually benign, cystic malformation of the posterior fossa characterized by a midline outpouching of the superior medullary velum into the cisterna magna that results from failure of the rudimental fourth ventricular tela choroidea to regress during embryogenesis. Patients can be asymptomatic or present in childhood or adulthood with clinical manifestations of hydrocephalus, such as headache, hypotonia, vertigo, syncope, vomiting, blurred or double vision, nystagmus, papilledema, and delayed gait development.
Key facts
- Prevalence
- <1 / 1 000 000
- Age of onset
- Antenatal
- Classified as
- Morphological anomaly
Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Related health topics
Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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