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Fig. 7B. —72-year-old man with patent ductus arteriosus. Transthoracic echocardiograms generated from parasternal short-axis projection obtained at level of aorta (AO) and main pulmonary artery (MPA) were helpful in determining correct diagnosis, but duct was not directly visualized on these or on any other echocardiograms. However, multidetector CT (Figs. 1A, and 1B) showed severe calcification of patent ductus arteriosus and allowed morphology to be classified as type A1 (Figs. 4A, and 4B). Diagnosis of patent ductus arteriosus was suggested by presence of diastolic flow originating from left of bifurcation of main pulmonary artery (arrow, left pulmonary artery is on right of image) and flowing up toward transducer.

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