"It is named after Joseph A Blake (1864-1937), an American physician who studied the physiology related to the foramen of Magendie 3."
"Blake's pouch cyst is a cystic appearing structure that represents posterior ballooning of the inferior medullary velum into the cisterna magna, below and posterior to the vermis, that communicates with an open fourth ventricle. It is caused by a failure of the regression of Blake's pouch secondary to the non-perforation of the foramen of Magendie 4,5."
"in childhood or adulthood with signs of hydrocephalus (usually headache, vomiting, blurred or double vision)"