Peribronchial cuffing
Peribronchial cuffing, also referred to as peribronchial thickening or bronchial wall thickening, is a radiologic sign which occurs when excess fluid or mucus buildup in the small airway passages of the lung causes localized patches of atelectasis (lung collapse).[1] This causes the area around the bronchus to appear more prominent on an X-ray. It has also been described as donut sign, considering the edge is thicker, and the center contains air.

Examples
    
Peribronchial cuffing is seen in a number of conditions including:
- Acute bronchitis
 - Asthma following exercise or during an acute episode
 - Bronchiolitis
 - Bronchopulmonary dysplasia
 - Congestive heart failure
 - Cystic fibrosis
 - Diffuse parenchymal lung disease
 - Extreme exertion through physical exercise
 - Hantavirus pulmonary syndrome
 - Human metapneumovirus
 - Kawasaki disease
 - Lung cancer
 - Pneumonia
 - Pulmonary edema
 - Smoke inhalation
 
Treatment
    
As peribronchial cuffing is a sign rather than a symptom or condition, there is no specific treatment except to treat the underlying cause.
References
    
- Bramson RT, Griscom NT, Cleveland RH (2005). "Interpretation of chest radiographs in infants with cough and fever". Radiology. 236 (1): 22–29. doi:10.1148/radiol.2361041278. PMID 15983074.
 
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