ventriculocisternostomy

noun
ven·​tric·​u·​lo·​cis·​ter·​nos·​to·​my | \ -ˌsis-tər-ˈnäs-tə-mē How to pronounce ventriculocisternostomy (audio) \
plural ventriculocisternostomies

Medical Definition of ventriculocisternostomy

: the surgical establishment of a communication between a ventricle of the brain and the subarachnoid space and especially the cisterna magna to drain cerebrospinal fluid especially in hydrocephalus