Hydranencephaly is a destructive or developmental disorder that results in partial or complete absence of cerebral hemispheres with resulting cavity, filled with CSF. But it does not involve the skull, meninges and cerebellum. CT proved to be unique tool in diagnosis of hydranencephaly. We analysed CT findings of 6 patients with hydranencephaly who visited Catholic Univ. Medical College Hopitals, durig last 6 years. RESULTS : 1. The male to female ratio was 1:2 and the age ranged 29 to 121 days. 2. Skull, brain stem, cerebellum and thalami were intact in all the cases. 3. Falx cerebri was fully intact in 2 cases and partially detective in 4 cases. 4. iIn 2 cases, the basal ganglia were seen bilaterally and symmetrically. 5. Remnant cerebral hemispheres were as follows : Partial and bilateral occipital lobes in all the cases. Partial and unilateral frontoparietal lobe in 1 case. Partial and bilateral temporal lobes in 1 case. 6. All resulting cavities were filled with fluid. 7. In all the cases, 3rd and 4th ventricles were present. 8. One case showed bilateral thickening of meningeal structures which was separated from the inner table of the skull.