The liver is especially good at regeneration. Tissues that seldom or never regenerate include nerves, skeletal muscle, heart muscle, and the lens of the eye. When injured, these are replaced with scar tissue. The size, shape, or organization of mature cells becomes abnormal. This is also called atypical hyperplasia.
Dysplasia is fairly common in the cells of the cervix and the lining of the respiratory tract.
The formation of cancerous, malignant tumors. This may be an extension of the processes causing hyperplasia and hypertrophy.