Bronchial casts are often large, thick, tenacious mucus "molds or impressions" of the inner lining of the bronchial tubes of our lungs. They can occur as a result of allergic inflammation, infection, or excessive reactivity to the presence of a foreign body or chemicals. They can be "expectorated" or coughed up by the patient but if they remain in the bronchial tubes they cause chest pain, shortness of breath and hypoxemia (low blood oxygen levels).
Obstructive Lung Diseases
Diseases may obstruct the lungs in several ways. Emphysema, asthma, and bronchitis are airway diseases that block the flow of air to the lungs. There are other types of lung disease that affect lung tissue and make it harder for lungs to expand or that block oxygen exchange. Cystic fibrosis and asthma are also obstructive lung diseases.
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