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Severe radiographic lesions of canine heartworm disease in a 6-year-old Boxer, ventrodorsal projection. Note the moderate to severe right-side cardiomegaly producing a "reverse D" appearance, the bulge in the region of the main pulmonary artery, and the enlarged left caudal pulmonary artery. MPA, main pulmonary artery; RA, right atrium; RV, right ventricle; RPA, right pulmonary artery; LPA, left pulmonary arteries.
Courtesy of the University of Florida.