The signs of pulmonary parenchymal vascular disease are not always obvious.
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“While we assume that pulmonary parenchymal vascular disease precedes pulmonary vascular disease, this is not always obvious. Some dogs have no physical or radiographic signs of pulmonary parenchymal disease but have severe pulmonary hypertension.”
-R. Lee Pyle, VMD, MS, DACVIM (cardiology); Jonathan Abbott, DVM, DACVIM (cardiology); and Heidi MacLean, DVM
From Severe pulmonary hypertension and cardiovascular sequelae in dogs