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Research Note: Ultrasonographic Peripheral Band & Suspected Lung Lobe Torsion

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This multicenter, observational study assessed the presence, distribution, and appearance of specific ultrasonographic features in dogs with lung lobe torsion. Of the 15 dogs in the study, 14 had a hypoechoic, peripheral band extending along the edge of the affected lung lobe with overlying areas of scattered hyperreflecting interfaces; these features were not observed in a single dog with an entirely consolidated lung lobe. Findings were then compared against CT and histologic features. CT findings included central emphysema surrounded by a peripheral, soft tissue attenuation band in 14 dogs; no band was noted in the dog with complete lung consolidation. Histologic examination revealed a comparable band consisting of thickened pleura. The authors concluded that an ultrasonograhic peripheral hypoechoic band associated with central emphysema in a noncollapsed lung lobe suggests compromised blood supply and air flow, and lung lobe torsion should therefore be suspected.

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