This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Following feature differentiate hydranencephaly from hydrocephalus ? 
Select and explain. 
A. Hydranencephaly is static while hydrocephalus continue to increase in size, B. Hydranencephaly does not cause increase in head size, C. Cerebral coex are deficiency/hypoplastic in hydranencephaly, D. All of the above
C: Cerebral coex are deficiency/hypoplastic in hydranencephaly
Answer: C: Cerebral coex are deficiency/hypoplastic in hydranencephaly 
Explanation: Ans. is 'c' i.e., Cerebral coex are deficiency/hypoplastic in hydranencephaly Hvdranencephaly is a rare encephalopathv that occurs in-utero. It is characterised by destruction of the cerebral hemispheres with transformation of the same into a membranous sac containing cerebrospinal fluid and the remnants of coex and white matter . The midbrain and brainstem are relatively intact. The cause of hydranencephaly is unknown, but bilateral occlusion of the internal carotid aeries during early fetal development would explain most of the pathologic abnormalities. Affected infants may have a normal or enlarged head circumference at bih that grows at an excessive rate postnatally. Transillumination shows an absence of the cerebral hemispheres. The child is irritable, feeds poorly, develops seizures and spastic quadriparesis, and has little or no cognitive development. A ventriculoperitoneal shunt prevents massive enlargement of the cranium.. Porencephaly is considered a less severe degree of the same pathology