8 year old Bichon Frise

Findings

There is hypoinflation of the lungs on all projections. The bronchi have irregularly thickened walls, causing a bronchial pattern. The airways do not taper in the periphery of the lung and appear widened. There is a diffuse interstitial pattern in the remainder of the lung. There is an ill-defined alveolar opacity on the left lateral projection superimposed on the 8th intercostal space. On the final lateral radiograph taken during expiration, there is complete collapse of the carina and mainstem bronchi. The cardiovascular structures, pleural space, and mediastinum appear normal.