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Unlayered polymicrogyria: structural and developmental aspects.

I Ferrer1, I Catalá

  • 1Departamento Anatomía Patológica, Hospital Príncipes de España, Facultad de Medicina, Universidad de Barcelona, Spain.

Anatomy and Embryology
|January 1, 1991
PubMed
Summary
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Unlayered polymicrogyria, a brain malformation, results from circulatory failure during fetal development. This impairs neuroblast migration and leads to characteristic cortical lesions and heterotopias.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Neuropathology

Background:

  • Unlayered polymicrogyria is a rare cortical malformation.
  • Its precise etiology and developmental mechanisms remain incompletely understood.

Purpose of the Study:

  • To investigate the pathological features and developmental origins of unlayered polymicrogyria.
  • To elucidate the role of circulatory failure in its pathogenesis.

Main Methods:

  • Analysis of four patients with established lesions and one fetus with developing lesions.
  • Histopathological examination including serial sections and Golgi studies.

Main Results:

  • Lesions were found near porencephalic clefts and in watershed areas, with periventricular neuronal heterotopias.

Related Experiment Videos

  • Microgyria resulted from radial cortical tissue cleavage, forming a glial scar.
  • Heterotopic nodules contained neurons misplaced from normal cortical layers.

    • Conclusions:

    • Unlayered polymicrogyria arises from circulatory failure before neuroblast migration completion.
    • Vascular compromise in radial or terminal arteries leads to cortical damage and migration defects.
    • Imbalanced tangential growth of affected areas contributes to the final morphology.