Lung ring-down artifact as a sign of pulmonary alveolar-interstitial disease.

Three dogs with presumptive cardiogenic pulmonary edema underwent a thoracic ultrasonographic examination. Multiple ring-down artifacts involving both sides of the thorax emanating from the pleural–lung interface were detected. When clinical and radiographic signs of pulmonary edema were resolved, ring-down artifacts were not observed. The ring-down artifact may be a useful diagnostic sign for screening the lung of animals with acute respiratory distress where radiographs are not feasible. Veterinary Radiology & Ultrasound, Vol. 49, No. 4, 2008, pp 374–377.