What is emphysema?

Emphysema is a swelling due to the abnormal presence of air in tissues or cavities of the body. The term usually refers to a condition of the lungs.
bullous e. Emphysema characterized by the presence of confluent air spaces in the lungs measuring over 1 cm in diameter; usually associated with generalized pulmonary emphysema.
centrilobular e. Emphysema in which the alveoli occupying the central area of each acinus become dilated and destroyed; generally more prominent in the upper lobes, but extending to all lung areas; commonly seen in chronic bronchitis.
mediastinal e. The presence of air in the mediastinal tissue.
panlobular e. Emphysema marked by enlarged lungs with loss of vascular lung
markings in areas of radiologic hyperlucency in the lower lobes; seen in individuals with homozygous α-1-antitrypsin deficiency.
pulmonary e. Lung disease characterized by enlargement of the alveoli with loss of elastic fibers and rapture of their walls.
subcutaneous e. The presence of air or gas in the subcutaneous tissues.

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