Following features differentiate hydranencephaly from hydrocephalus
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: Nelson's 20th edition, page 2817
Hydranencephaly is static whilst hydrocephalus continues to increase in size
Hydranencephaly does not increase in head size
Cerebral coex is deficient /hypoplastic in hydranencephaly
All of the above
General anatomy