Categories: Respiratory Diseases
A condition in which there is air or gas in tissues that
normally have none, or an excess of air in tissues that normally contain a
certain quantity of it. A condition of the lungs characterized by a
permanent dilation of the air cells of the lung with dwindling of the air
cell walls and the blood vessels, resulting in a loss of the normal
elasticity of the lung tissue.
Causes. Heredity; it occurs in glass blowers, in musicians using wind
instruments. It occurs also after whooping-cough, asthma, etc.