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Arachnoid cysts in a brother and sister.
  1. W G Wilson,
  2. K A Deponte,
  3. J McIlhenny,
  4. F E Dreifuss
  1. Department of Pediatrics, University of Virginia Medical Center, Charlottesville.


    We describe a brother and sister with microcephaly and mental retardation who were shown by cranial CT scan to have almost identical unilateral arachnoid cysts. The occurrence in sibs suggests the possibility of a genetic basis for at least some cases of arachnoid cysts.

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