Page 455 - Atlas of Small Animal CT and MRI

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Figure 4.5.2 Bronchial Dysplasia (Canine) CT

(a) DX, RLAT (b) DX, DV

(c) CT, TP (d) CT, TP (e) CT+C, TP

(f) CT, DP (g) ES
6mo F Miniature Pinscher with chronic cough, exercise intolerance, and recent onset of dyspnea. Images c–e are representative CT
images in the cranial (c) and middle (d,e) thorax. Images d and e are at the same level and are lung and soft‐tissue windowed, respec­
tively. The left lung is atelectatic (a,b), but primary and lobar bronchi are air‐filled and clearly delineated (b: arrows). Compensatory right
lung hyperinflation results in a left‐sided mediastinal shift (b). Mainstem bronchi are displaced dorsally and to the left in the cranial
thorax (c,f: arrowheads). Smaller air bronchograms are present further caudally (d: arrows), and atelectatic lung contrast enhances
(e: arrow) indicating unimpeded parenchymal perfusion. Evaluation of the entire CT examination revealed that only the right middle lung
lobe was inflated. The right middle lobar bronchus can be seen (d: arrowhead). The mainstem bronchial lumina are malformed and par­
tially occluded (g). Microscopic evaluation of surgically excised lung revealed malformation of large and small airways consistent with
congenital bronchial dysplasia.

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