### Abstract

Abnormally enlarged neurons (AEN) occur in many neurodegenerative diseases. To define AEN more objectively, the frequency distribution of the ratio of greatest cell diameter(CD) to greatest nuclear diameter (ND) was studied in populations of cortical neurons in tissue sections of seven cognitively normal brains. The frequency distribution of CD/ND deviated from a normal distribution in 15 out of 18 populations of neurons studied and hence, the 95th percentile (95P) was used to define a limit of the CD/ND ratio excluding the5% most extreme observations. The 95P of the CD/ ND ratio varied from 2.0 to 3.0 in different cases and regions and a value of 95P = 3.0 was chosen to define the limit for normalneurons under non-pathological conditions. Based on the 95P = 3.0 criterion, the proportion of AEN with a CD/ND ≥ 3 varied from 2.6% in Alzheimer's disease (AD) to 20.3% in Pick's disease (PiD). The data suggest: (1) that a CL/ND ≥ 3.0 may be a useful morphological criterion for defining AEN, and (2) AEN were most numerous in PiD and corticobasal degeneration (CBD) and least abundant in AD and in dementia with Lewy bodies (DLB). © 2013 Dustri-Verlag Dr. K. Feistle.

Original language | English |
---|---|

Pages (from-to) | 128-133 |

Number of pages | 6 |

Journal | Clinical Neuropathology |

Volume | 32 |

Issue number | 2 |

DOIs | |

Publication status | Published - Mar 2013 |

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### Keywords

- 95th percentile (95P)
- Abnormally enlarged neurons (AEN)
- Cognitively normal brain
- Neurodegenerative disease
- Ratio of cell diameter to nucleus diameter (CD/ND)

### Cite this

*Clinical Neuropathology*,

*32*(2), 128-133. https://doi.org/10.5414/NP300516

}

*Clinical Neuropathology*, vol. 32, no. 2, pp. 128-133. https://doi.org/10.5414/NP300516

**A quantitative study of abnormally enlarged neurons in cognitively normal brain and neurodegenerative disease.** / Armstrong, Richard A.

Research output: Contribution to journal › Article

TY - JOUR

T1 - A quantitative study of abnormally enlarged neurons in cognitively normal brain and neurodegenerative disease

AU - Armstrong, Richard A.

PY - 2013/3

Y1 - 2013/3

N2 - Abnormally enlarged neurons (AEN) occur in many neurodegenerative diseases. To define AEN more objectively, the frequency distribution of the ratio of greatest cell diameter(CD) to greatest nuclear diameter (ND) was studied in populations of cortical neurons in tissue sections of seven cognitively normal brains. The frequency distribution of CD/ND deviated from a normal distribution in 15 out of 18 populations of neurons studied and hence, the 95th percentile (95P) was used to define a limit of the CD/ND ratio excluding the5% most extreme observations. The 95P of the CD/ ND ratio varied from 2.0 to 3.0 in different cases and regions and a value of 95P = 3.0 was chosen to define the limit for normalneurons under non-pathological conditions. Based on the 95P = 3.0 criterion, the proportion of AEN with a CD/ND ≥ 3 varied from 2.6% in Alzheimer's disease (AD) to 20.3% in Pick's disease (PiD). The data suggest: (1) that a CL/ND ≥ 3.0 may be a useful morphological criterion for defining AEN, and (2) AEN were most numerous in PiD and corticobasal degeneration (CBD) and least abundant in AD and in dementia with Lewy bodies (DLB). © 2013 Dustri-Verlag Dr. K. Feistle.

AB - Abnormally enlarged neurons (AEN) occur in many neurodegenerative diseases. To define AEN more objectively, the frequency distribution of the ratio of greatest cell diameter(CD) to greatest nuclear diameter (ND) was studied in populations of cortical neurons in tissue sections of seven cognitively normal brains. The frequency distribution of CD/ND deviated from a normal distribution in 15 out of 18 populations of neurons studied and hence, the 95th percentile (95P) was used to define a limit of the CD/ND ratio excluding the5% most extreme observations. The 95P of the CD/ ND ratio varied from 2.0 to 3.0 in different cases and regions and a value of 95P = 3.0 was chosen to define the limit for normalneurons under non-pathological conditions. Based on the 95P = 3.0 criterion, the proportion of AEN with a CD/ND ≥ 3 varied from 2.6% in Alzheimer's disease (AD) to 20.3% in Pick's disease (PiD). The data suggest: (1) that a CL/ND ≥ 3.0 may be a useful morphological criterion for defining AEN, and (2) AEN were most numerous in PiD and corticobasal degeneration (CBD) and least abundant in AD and in dementia with Lewy bodies (DLB). © 2013 Dustri-Verlag Dr. K. Feistle.

KW - 95th percentile (95P)

KW - Abnormally enlarged neurons (AEN)

KW - Cognitively normal brain

KW - Neurodegenerative disease

KW - Ratio of cell diameter to nucleus diameter (CD/ND)

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UR - http://www.dustri.com/article-response-page.html?artId=10042&doi=10.5414%2FNP300516

U2 - 10.5414/NP300516

DO - 10.5414/NP300516

M3 - Article

C2 - 23073168

VL - 32

SP - 128

EP - 133

JO - Clinical Neuropathology

JF - Clinical Neuropathology

SN - 0722-5091

IS - 2

ER -