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X-linked lissencephaly in a newborn and a 2 year old (microscopic structure of the cortex)

(A) The 6 cortical layers in the normal newborn have an orderly appearance. (B) In the 2 year old, the 6-layered cortex is replaced by a poorly laminated 4-layered cortex. The fourth layer extends beyond the limits of the image. (Size bar=1 mm) (Contributed by Dr. Joseph Gleeson.)

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Associated Disorders

  • Developmental delay
  • Epilepsy
  • Mental retardation