Developmental Growth - During embryonic and fetal life, cell growth is often very rapid. However, the orderly and highly predictable structures of the organs of higher organisms indicate that this developmental growth is very well-regulated.
Most human organs are capable of some sort of reparative growth following an injury.
In some cases, proliferation of both parenchymal and stromal elements results in essentially complete restoration of normal function. Hamartoma - Hamartoma is a focal overgrowth of tissue of a type normally found in the organ in question. Hamartomata are apparently developmental malformations and are distinguished from neoplasms by the fact that they do not exhibit continued growth. However, they are another group of tumor-like tissue masses which may be confused with neoplasms. Hyperplasia - Hyperplasia is an increase in the number of cells in an organ or tissue which occurs in response to a stimulus and which ceases when the stimulus is removed.