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Incomplete Hippocampal Inversion: A Comprehensive MRI Study of Over 2000 Subjects.

Claire Cury1, Roberto Toro2, Fanny Cohen3

  • 1Institut national de la santé et de la recherche médicale, U1127Paris, France; Centre National de la Recherche Scientifique, UMR 7225 Institut du Cerveau et de la Moelle épinièreParis, France; Sorbonne Universités, Université Pierre et Marie Curie Univ Paris 06, UMR S 1127Paris, France; Institut du Cerveau et de la Moelle épinière, Institut du Cerveau et de la Moelle épinièreParis, France; Inria, Aramis Team, Centre de Recherche Paris-RocquencourtParis, France; Centre d'Acquisition et de Traitement des ImagesParis, France.

Frontiers in Neuroanatomy
|January 7, 2016
PubMed
Summary

Incomplete-hippocampal-inversion (IHI), a hippocampal malrotation, is common, especially on the left side in healthy individuals. This anatomical variation is linked to morphological changes beyond the hippocampus.

Keywords:
IMAGEN databaseLarge databaseMRIanatomical variabilitybrain developmentcortical sulcihuman hippocampusmalrotation

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Area of Science:

  • Neuroanatomy
  • Human Anatomy
  • Brain Imaging

Background:

  • Incomplete-hippocampal-inversion (IHI), or malrotation, is an atypical hippocampal anatomical pattern observed in healthy individuals.
  • Previous studies reported IHI, but extensive characterization in large samples and its association with broader anatomical changes remain unclear.

Purpose of the Study:

  • To extensively characterize IHI in a large, community-based sample.
  • To investigate whether IHI are confined to the medial-temporal lobe or linked to extra-hippocampal anatomical variations.

Main Methods:

  • Utilized T1-weighted anatomical MRI from 2008 subjects in the IMAGEN database.
  • Assessed IHI presence using visual criteria.
  • Employed automatic morphometry of cortical sulci to identify associated anatomical changes.

Main Results:

  • IHI was significantly more frequent in the left hippocampus (17%) than the right (6%) (p < 10(-28)).
  • Subjects with IHI exhibited morphological changes in several sulci, primarily within the limbic lobe.
  • Demonstrated a left-sided prevalence of IHI in healthy subjects.

Conclusions:

  • Incomplete-hippocampal-inversion is a common, predominantly left-sided anatomical variation in healthy individuals.
  • IHI is associated with morphological alterations extending beyond the medial-temporal lobe, particularly in the limbic lobe.