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Correlation between volume and morphological changes in the hippocampal formation in Alzheimer’s disease: rounding of the outline of the hippocampal body on coronal MR images

  • Diagnostic Neuroradiology
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Abstract

Introduction

The aim of this study was to investigate whether the outline of the hippocampal body becomes rounded on coronal magnetic resonance imaging (MRI) as the volume of the hippocampal formation decreases in Alzheimer’s disease (AD).

Methods

Institutional review board approval of the study protocol was obtained, and all subjects provided informed consent for the mini-mental state examination (MMSE) and MRI. The MRI and MMSE were prospectively performed in all 103 subjects (27 men and 76 women; mean age ± standard deviation, 77.7 ± 7.8 years) who had AD or were concerned about having of dementia and who consulted our institute over 1 year. The subjects included 14 non-dementia cases (MMSE score ≥ 28) and 89 AD cases (MMSE score ≤ 27). The total volume of the bilateral hippocampal formation (VHF) was assessed with a tracing method, and the ratio of the VHF to the intracranial volume (RVHF) and the rounding ratio (RR) of the hippocampal body (mean ratio of its short dimension to the long dimension in the bilateral hippocampal body) were calculated. Using Spearman’s correlation coefficient, the correlations between RR and VHF and between RR and RVHF were assessed.

Results

Correlation coefficients between RR and VHF and between RR and RVHF were −0.419 (p < 0.01) and −0.418 (p < 0.01), respectively. There was a significant negative correlation between RR and the volume of the hippocampal formation.

Conclusion

The outline of the body of the hippocampal formation becomes rounded on coronal images as its volume decreases in AD.

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Conflict of interest

We declare that we have no conflict of interest.

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Authors and Affiliations

  1. Department of Radiology, Ohshima Clinic, 4-1-14 Sakurada Nishi, Yamagata, 990-2321, Japan

    Michito Adachi & Takamichi Sato

  2. Department of Psychiatry, Yamagata University School of Medicine, 2-2-2 Iidanishi, Yamagata, 990-9585, Japan

    Shinobu Kawakatsu

  3. Department of Neurology, Ohshima Clinic, 4-1-14 Sakurada Nishi, Yamagata, 990-2321, Japan

    Fumi Ohshima

Authors
  1. Michito Adachi
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  2. Shinobu Kawakatsu
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  3. Takamichi Sato
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  4. Fumi Ohshima
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Correspondence to Michito Adachi.

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Adachi, M., Kawakatsu, S., Sato, T. et al. Correlation between volume and morphological changes in the hippocampal formation in Alzheimer’s disease: rounding of the outline of the hippocampal body on coronal MR images. Neuroradiology 54, 1079–1087 (2012). https://doi.org/10.1007/s00234-012-1019-7

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  • DOI: https://doi.org/10.1007/s00234-012-1019-7

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