 Sometimes small encephaloceles in the nasal cavity and forehead are undetected.Hydranencephaly is a condition in which the cerebral hemispheres are missing and instead filled with sacs of cerebrospinal fluid.People are born with hydranencephaly, but most of the time, the symptoms appear in a later stage.Newborns with hydrancephaly can swallow, cry, sleep and their head is in proportion to their body.