Various causes: Engorgement is due to volume overload as from congestive heart failure or renal failure. Focal enlargement of a vessel may indicated an aneurysm. Widening of the mediastinum can indicate aortic dissection. Central pulmonary artery prominence can be due to pulmonary hypertension. Poor x-ray technique can cause magnification that is artifactual. I'm not a radiologist but that's a quick answer.
Answered 12/21/2013
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