Mondo Description Bronchiolitis obliterans syndrome (BOS) is a lung disorder that is mainly associated with chronic allograft dysfunction after lung transplantation and that is characterized by inflammation and fibrosis of bronchiolar walls that reduce the diameter of the bronchioles and result in progressive and irreversible airflow obstruction.

Disease Ontology Description A obstructive lung disease involving obstruction of the bronchioles due to inflammation and fibrosis which occurs as a complication of various lung conditions or physiological insults.