NCIt definition : Inflammation of the bronchioles with obstruction by fibrous granulation tissue or
bronchial exudate. It may follow inhalation of irritating gases or foreign bodies
and it complicates pneumonia.;
Alternative definition : NCI-GLOSS: A condition in which the bronchioles (tiny branches of air tubes in the
lungs) become inflamed and blocked. It may be caused by breathing in gases or particles
that irritate the bronchioles. This irritation causes scar tissue to form, and makes
breathing difficult. Bronchiolitis olbiterans may be caused by other factors, and
can also occur after a transplant with an organ or stem cells from a matched donor.;