Bronchiolitis obliterans. Definition

Medical Definition: Bronchiolitis obliterans

A condition in which the bronchioles (divisions tiny air tubes in the lungs) become inflamed and blocked. It can result from inhalation of gases or particles that irritate the bronchioles. This irritation causes scarring of the tissue and makes breathing difficult. Bronchiolitis obliterans may be caused by other factors and can also occur after an organ transplant or stem cell transplant from a matched donor.

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