Fig. 2

Computed tomographic (CT) inspiratory images in a one-year old cat with progressive respiratory signs. The CT images (A-G) were acquired 2 days after the second set of radiographic images (shown in Fig. 1C-D) except for G’ (inset) depicting the same region as in G, but 5 months later. Linear opacities were the predominant lesions followed by parenchymal opacification lesions and both categories were observed multifocally throughout the entire length of the thorax, as shown on the multiplane reconstruction sagittal (D) and dorsal (F) images. (A, inset (A’)) Numerous parenchymal bands (V-shaped arrows), subpleural lines (triangle-shaped arrows) and subpleural interstitial thickening were seen. (B) Parenchymal bands varied in thickness and were predominantly located at the periphery of the lungs, some of them contacting both mediastinal and costal surfaces of the pleura (V-shaped arrows). (C) Subpleural interstitial thickening (black arrows) occasionally summated with vessels. (A, A’, C, E) Bronchovascular bundle thickening (white arrowheads) and tree-in-bud pattern (black arrowhead) were seen multifocally often with non-tapering of small airways (*). Parenchymal opacification consisting of ground glass opacity (white arrows in E and F) and a few areas of consolidation (black arrows in F) were present multifocally. Some of the linear opacities were difficult to differentiate from thickened bronchovascular bundles as seen in G. Comparison with a CT image of the same level acquired 5 months later allows to appreciate the extent of the linear opacities initially present and their subsequent resolution