Merck Manual

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Canine heartworm disease, severe radiographic lesions (VD)
Canine heartworm disease, severe radiographic lesions (VD)

Severe radiographic lesions of canine heartworm disease in a 6-yr-old Boxer, ventrodorsal projection. Note the moderate to severe right-side cardiomegaly producing a "reverse D" appearance and the bulge in the region of the main pulmonary artery.

Courtesy of the University of Florida.