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Abstract

Are the brains of monozygotic twins similar? A three-dimensional MR study.

A Biondi, H Nogueira, D Dormont, M Duyme, D Hasboun, A Zouaoui, M Chantôme and C Marsault
American Journal of Neuroradiology August 1998, 19 (7) 1361-1367;
A Biondi
Department of Neuroradiology, Pitié-Salpêtrière Hospital, University Paris VI, France.
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H Nogueira
Department of Neuroradiology, Pitié-Salpêtrière Hospital, University Paris VI, France.
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D Dormont
Department of Neuroradiology, Pitié-Salpêtrière Hospital, University Paris VI, France.
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M Duyme
Department of Neuroradiology, Pitié-Salpêtrière Hospital, University Paris VI, France.
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D Hasboun
Department of Neuroradiology, Pitié-Salpêtrière Hospital, University Paris VI, France.
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A Zouaoui
Department of Neuroradiology, Pitié-Salpêtrière Hospital, University Paris VI, France.
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M Chantôme
Department of Neuroradiology, Pitié-Salpêtrière Hospital, University Paris VI, France.
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C Marsault
Department of Neuroradiology, Pitié-Salpêtrière Hospital, University Paris VI, France.
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Abstract

PURPOSE The role of genetic mechanisms and the influence of environmental events in human brain development have been difficult to evaluate. The purpose of this study was to compare the cerebral cortical morphology and midline structures of monozygotic twin pairs using MR imaging.

METHODS Six observers, blinded to twin pairings, evaluated the 3-D renderings of the cortical surface and midline structures from MR images of seven monozygotic twin pairs. A morphometric analysis of the corpus callosum and of the distance between the anterior and posterior commissures was also performed.

RESULTS Despite surprising anatomic differences, the brains of the twin pairs were similar enough to enable the observers to distinguish twin pairs from unrelated subjects. Five of six observers correctly identified the brains of all seven twin pairs; the remaining observer failed to make a correct match in only one of seven pairs. Three of six observers identified the midline sagittal images of the related twins in all seven pairs, and the other three identified the related midline sagittal images in five of seven pairs. The results were statistically significant.

CONCLUSION Although the observed differences in morphologic characteristics between twins necessarily reflect nongenetic influences, the cortical patterns and midline structures of monozygotic twins probably are genetically similar.

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American Journal of Neuroradiology
Vol. 19, Issue 7
1 Aug 1998
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Are the brains of monozygotic twins similar? A three-dimensional MR study.
A Biondi, H Nogueira, D Dormont, M Duyme, D Hasboun, A Zouaoui, M Chantôme, C Marsault
American Journal of Neuroradiology Aug 1998, 19 (7) 1361-1367;

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Are the brains of monozygotic twins similar? A three-dimensional MR study.
A Biondi, H Nogueira, D Dormont, M Duyme, D Hasboun, A Zouaoui, M Chantôme, C Marsault
American Journal of Neuroradiology Aug 1998, 19 (7) 1361-1367;
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