Disease or Syndrome
bronchiolitis obliterans Audio
[ brong-kee-oh-ly-tis ob-lih-teh-ranz ]
Subclass of:
Bronchiolitis
Definitions related to bronchiolitis obliterans:
  • 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.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • Inflammation and fibrosis of the bronchioles leading to partial or complete obstruction of these airways.
    Human Phenotype Ontology (HPO)
    The Human Phenotype Ontology Project, 2025
  • Inflammation of the BRONCHIOLES leading to an obstructive lung disease. Bronchioles are characterized by fibrous granulation tissue with bronchial exudates in the lumens. Clinical features include a nonproductive cough and DYSPNEA.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • 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.
    NCI
    U.S. National Cancer Institute, 2021
  • (bronchiolitis obliterans with obstructive pulmonary disease) 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.
    OrphaNet
    INSERM, 2021
  • Bronchiolitis obliterans is an inflammatory condition that affects the lung's tiniest airways, the bronchioles. In affected people, the bronchioles may become damaged and inflamed leading to extensive scarring that blocks the airways. Signs and symptoms of the condition include a dry cough; shortness of breath; and/or fatigue and...
    NIH Genetic and Rare Diseases
    National Center for Advancing Translational Sciences
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