Merck Manual

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Canine heartworm disease, severe radiographic lesions (ventrodorsal view)
Canine heartworm disease, severe radiographic lesions (ventrodorsal view)
Canine heartworm disease, severe radiographic lesions (ventrodorsal view)

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.