Gray matter volumes and cognitive ability in the epileptogenic brain malformation of periventricular nodular heterotopia

Linsey M. Walker, Tami Katzir, Tianming Liu, Jenny Ly, Kathleen Corriveau, Mirit Barzillai, Felicia Chu, Margaret G. O'Connor, David B. Hackney, Bernard S. Chang

Research output: Contribution to journalArticlepeer-review

Abstract

Periventricular nodular heterotopia (PNH) is a brain malformation clinically characterized by the triad of epilepsy, normal intelligence, and dyslexia. We investigated the structure-function relationship between cerebral volumes and cognitive ability in this disorder by studying 12 subjects with PNH and 6 controls using volumetric analysis of high-resolution anatomical MRI and neuropsychological testing. Total cerebral volumes and specific brain compartment volumes (gray matter, white matter, and cerebrospinal fluid) in subjects with PNH were comparable to those in controls. There was a negative correlation between heterotopic gray matter volume and cortical gray matter volume. Cerebral and cortical volumes in PNH did not correlate with Full Scale IQ, unlike in normal individuals. Our findings support the idea that heterotopic nodules contain misplaced neurons that would normally have migrated to the cortex, and suggest that structural correlates of normal cognitive ability may be different in the setting of neuronal migration failure.

Original languageEnglish
Pages (from-to)456-460
Number of pages5
JournalEpilepsy and Behavior
Volume15
Issue number4
DOIs
StatePublished - Aug 2009

Bibliographical note

Funding Information:
We thank all of our subjects for participating in this study; without them this research would not have been possible. B.S.C. was supported by the National Institute of Neurological Disorders and Stroke (Grant K23 NS049159). B.S.C. and T.K. were supported by the Mind–Brain–Behavior Initiative of Harvard University.

Keywords

  • Intelligence
  • Malformation of cortical development
  • Periventricular nodular heterotopia
  • Volumetric magnetic resonance imaging

ASJC Scopus subject areas

  • Clinical Neurology
  • Neurology
  • Behavioral Neuroscience

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