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Fig. 2D. —49-year-old man evaluated for questionable aortic root
dilatation seen on transthoracic echocardiography. Ao = aorta. AAo= ascending
aorta, DAo = descending aorta, PA = pulmonary artery, LV = left ventricle.
Sagittal multiplanar reconstruction (C) with mediastinal window
settings (level, 400 H; width, 40 H) and (D) with optimized window
settings (level, 400 H; width, 280 H) show that contrast-enhanced PDA forms
subtle "positive jet" (arrow) flowing through PDA
(asterisk) from enhanced aorta to less-opacified pulmonary artery.
Appropriate use of window settings is necessary to identify this subtle
finding.
