Supratentorial arachnoidal cyst associated with hydrocephalus.

Supratentorial arachnoidal cysts are usually associated with signs of fracture of the skull but hydrocephalus has not been reported in connexion with such cysts. In none of the 18 cases reviewed by Tiberin and Gruszkiewicz (1961) was hydrocephalus found. A 3-year-old child was recently seen with signs of hydrocephalus and a large arachnoidal cyst of the right cerebral hemisphere. The rarity of such an association warrants this report.

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