Page 474 - Atlas of Small Animal CT and MRI

464 Atlas of Small Animal CT and MRI

Figure 4.6.3 Pulmonary Bullae (Canine) CT

(a) CT, TP (b) CT, TP (c) CT, TP
13y M Fox Terrier with solitary pulmonary adenocarcinoma (not shown). Representative CT images of the middle and caudal thorax,
ordered from cranial to caudal, reveal multiple thin‐walled bullae of varying size. Bullae are documented to be spherical and distin-
guished from tubular airways by viewing multiple consecutive images. Bullae are also of larger diameter than expected for airways in the
periphery of the lung (a–c: large arrows). Unlike bullae, airways also branch (c: arrowhead) and are flanked by pulmonary arteries and
veins (b,c: small arrows). The multiple bullae were clinically silent and thought to be developmental in this dog. Gross and microscopic
evaluation of representative bullae removed during lung lobectomy confirmed the imaging diagnosis.

Figure 4.6.4 Cardiogenic Pulmonary Edema (Feline) CT

(a) CT, TP (b) CT, TP (c) CT, TP
4y FS Domestic Shorthair currently receiving dialysis for renal failure. The cat had echocardiographic signs of mild cardiomyopathy and
was moderately fluid overloaded at the time of the CT examination. Image a is a representative image at the level of the caudal thorax,
and images b and c are magnified views of image a. A small volume of dependent pleural fluid elevates aerated lung (a: black arrow-
head). There is a mild, diffuse increase in pulmonary attenuation with additional multiple focal regions of ground‐glass opacity. The latter
infiltrates appear to be most pronounced surrounding the pulmonary vasculature (a–c: white arrowheads). Postmortem examination
confirmed the infiltrates were due to pulmonary edema. In this cat, the edema was thought to be due to relative ventricular failure from
the combination of cardiomyopathy and fluid overload.

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