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Subcortical band heterotopia (gross specimen from an adult patient)

The pathological abnormality in subcortical band heterotopia is characterized by 2 layers of gray matter (arrows). The outer cortex appears normal, grossly and microscopically. A subcortical heterotopic layer of neurons in the subcortical white matter (inner arrow) does not extend into the gyri of the outer cortex. (Contributed by Dr. Joseph Gleeson.)

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Associated Disorders

  • Developmental delay
  • Epilepsy
  • Mental retardation