Severe hydrocephalus simulating hydranencephaly
Delayed motor and mental milestones and progressive head enlargement
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Thin cortical mantle is only noted at the gyrus rectus (inferior part of frontal lobe) and temporal lobes. There is also thin rim of brain tissue seen at the frontal region bilaterally and at the lateral aspect of falx cerebri. The falx is present and thick and the posterior fossa is unremarkable.
Severe hydrocephalus may simulate hydranencephaly. The clue for diagnosis is presence of cortical mantle i.e. rim of brain tissue lining the inner skull table.