Peribronchial cuffing refers to a radiographic term used to describe haziness or increased density around the walls of a bronchus or large bronchiole seen end-on, both on plain radiographs and on CT. It is sometimes described as a "doughnut sign". When viewed tangentially, it can give the appearance of tram tracks .
It may either represent bronchial wall thickening or fluid around bronchi due to lymphatic congestion .
It can be seen in a number of pathologies, which include: