Changes

There are several [[Cell Growth Disorders|changes in the size of cells]] and their respective organs that are commonly seen in pathological states:

There are several [[Cell Growth Disorders|changes in the size of cells]] and their respective organs that are commonly seen in pathological states:

*'''Atrophy''' is a decrease in the size of the cells and respective organ(s), occurring after the organ has reached it's normal size.  

*'''Atrophy''' is a decrease in the size of the cells and respective organ(s), occurring after the organ has reached it's normal size.  

*'''Hypertrophy''' is an increase in the size of an organ due to an increase in size of the individual cells.  

*'''Hypertrophy''' is an increase in the number of an organ due to an increase in size of the individual cells.  

*'''Hypoplasia''' is a reduction in the size of cells and tissues due to a failure to grow to the normal size which ranges from mild hypoplasia to almost complete absence. Almost complete absence is also called vestigial or rudimentary.  

*'''Hypoplasia''' is a reduction in the number of cells and tissues due to a failure to grow to the normal size which ranges from mild hypoplasia to almost complete absence. Almost complete absence is also called vestigial or rudimentary.  

*'''Aplasia''' and '''agensis''' refer to complete absence of tissue.  

*'''Aplasia''' and '''agensis''' refer to complete absence of tissue.  

*'''Hyperplasia''' is an increase in the size of an organ due to an increase in the numbers of cells present within it. Hypertrophy and hyperplasia may occur concurrently.  

*'''Hyperplasia''' is an increase in the size of an organ due to an increase in the numbers of cells present within it. Hypertrophy and hyperplasia may occur concurrently.