title: Quantitative and qualitative computed tomographic characteristics of bronchiectasis in 12 dogs.
abstract: Bronchiectasis is an irreversible dilatation of the bronchi resulting from chronic airway inflammation. In people, computed tomography (CT) has been described as the noninvasive gold standard for diagnosing bronchiectasis. In dogs, normal CT bronchoarterial ratios have been described as <2.0. The purpose of this retrospective study was to describe quantitative and qualitative CT characteristics of bronchiectasis in a cohort of dogs with confirmed disease. Inclusion criteria for the study were thoracic radiography, thoracic CT, and a diagnosis of bronchiectasis based on bronchoscopy and/or histopathology. For each included dog, a single observer measured CT bronchoarterial ratios at 6 lobar locations. Qualitative thoracic radiography and CT characteristics were recorded by consensus opinion of two board-certified veterinary radiologists. Twelve dogs met inclusion criteria. The mean bronchoarterial ratio from 28 bronchiectatic lung lobes was 2.71 ± 0.80 (range 1.4 to 4.33), and 23/28 measurements were >2.0. Averaged bronchoarterial ratios from bronchiectatic lung lobes were significantly larger (P < 0.01) than averaged ratios from nonbronchiectatic lung lobes. Qualitative CT characteristics of bronchiectasis included lack of peripheral airway tapering (12/12), lobar consolidation (11/12), bronchial wall thickening (7/12), and bronchial lumen occlusion (4/12). Radiographs detected lack of airway tapering in 7/12 dogs. In conclusion, the most common CT characteristics of bronchiectasis were dilatation, a lack of peripheral airway tapering, and lobar consolidation. Lack of peripheral airway tapering was not visible in thoracic radiographs for some dogs. For some affected dogs, bronchoarterial ratios were less than published normal values.
authors.affiliation: Veterinary Medical Teaching Hospital, School of Veterinary Medicine, 1 Shields Ave., University of California, Davis, CA, 95616.
authors.forename: Matthew S
authors.initials: MS
authors.lastname: Cannon
authors.affiliation: Department of Medicine and Epidemiology, School of Veterinary Medicine, 1 Shields Ave, University of California, Davis, CA, 95616.
authors.forename: Lynelle R
authors.initials: LR
authors.lastname: Johnson
authors.affiliation: Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, 1 Shields Ave, University of California, Davis, CA, 95616.
authors.forename: Patricia A
authors.initials: PA
authors.lastname: Pesavento
authors.affiliation: Department of Population Health and Reproduction, School of Veterinary Medicine, 1 Shields Ave, University of California, Davis, CA, 95616.
authors.forename: Philip H
authors.initials: PH
authors.lastname: Kass
authors.affiliation: Department of Surgical and Radiological Sciences, School of Veterinary Medicine, 1 Shields Ave, University of California, Davis, CA, 95616.
authors.forename: Erik R
authors.initials: ER
authors.lastname: Wisner
mesh_terms: D000818:Animals; D001980:Bronchi / Q000473:pathology*; D001987:Bronchiectasis / Q000000981:diagnostic imaging / Q000473:pathology / Q000662:veterinary*; D001999:Bronchoscopy / Q000662:veterinary; D004283:Dog Diseases / Q000000981:diagnostic imaging / Q000473:pathology*; D004285:Dogs; D005260:Female; D008297:Male; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000662:veterinary
keywords: CT; bronchiectasis; bronchoarterial ratio; dogs