"Pulmonary artery flow artifact, also known as pulmonary artery smoke 1, is a non-uniform contrast opacification of pulmonary arteries due to a non-homogenous contrast-blood mixing, generally due to turbulent blood flow or an early acquisition."
"regional pulmonary hypertension (e.g. bronchiectasis, fibrosis due to lung parenchymal disease, vessel stenosis, or occlusion)"
"Non-opacification of the left cardiac chambers is a sign of early acquisition as contrast does not have time to opacify the distal pulmonary arteries."
"regional pulmonary hypertension (e.g. bronchiectasis, fibrosis due to lung parenchymal disease, vessel stenosis, or occlusion)"
"There is no vessel lumen expansion (no mass effect)."
"There are usually background changes of pulmonary artery hypertension, bronchiectasis, and associated chronic lung disease."