<prompt> Following features differentiate hydranencephaly from hydrocephalusHydranencephaly is static whilst hydrocephalus continues to increase in sizeHydranencephaly does not increase in head sizeCerebral coex is deficient hypoplastic in hydranencephalyAll of the above  <response>: In hydranencephaly, cerebral hemispheres are absent or are represented by membranous sacs with remnants of frontal, temporal or occipital coex dispersed over the membrane while the midbrain and brainstem are relatively intact. Ref: Nelsons 20th edition, page 2817 