====== Posterior fossa cyst differential diagnosis ======

see [[Intracranial cyst differential diagnosis]].


Includes:
a) cyst associated with [[Dandy Walker malformation]]. Cerebellar vermis is usually hypoplastic
(or, less commonly, completely absent). Hydrocephalus often present

b) epidermoid 

c) enlarged (mega) cisterna magna  may mimic a cyst. No mass effect on cerebellum

d) [[cerebellar hemangioblastoma]]: often has an enhancing mural nodule 

e) [[arachnoid cyst]] of posterior fossa: usually associated with mass effect on cerebellum

f) [[neurenteric cyst]]
 
g) pilocytic astrocytoma of the cerebellum: usually has an enhancing mural nodule.