there are lots of causes that can explain the xray finding. varying from poor xray quality film to pulmonary hypertension or heart problem. more details are needed with respect to history of symptoms and a proper physical exam must be done. you might need to do a CT scan of chest and/or echocardiogram to check all the above
The sentence: accentuation...., is a nonspecific descriptive sentence based on a subjective assessment or impression. Often it does not correspond to any real abnormality. I myself do not use this in my reports. I prefer to give a precise description of the abnormality, which could be one of the following examples:
-Bronchial wall thickening seen in chronic asthma, or in chronic bronchitis also known as chronic obstructive airways disease (in smokers).
-Dilatation of the arteries in cases of heart failure, or rarely in shunts of the heart.
-Linear infiltrates in edema from heart failure
-Illdefined linear infiltrates in bronchopneumonia(infection)
As you can deduce from the above, any of these findings should be correlated with the clinical symptoms to see if they fit.