Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in sitting semi-upright position . Comparison is made with the next preceding similar study obtained five hours earlier during the same day . Status post sternotomy , previous bypass surgery and moderate cardiac enlargement , appear unchanged . Comparison of the pulmonary vasculature clearly identifies a more marked vascular plethora that has developed during the latest examination interval of less than five hours . There is a degree of perivascular haze suggestive of some beginning interstitial edema . The lateral pleural sinuses remain grossly free . No evidence of pneumothorax in the apical area . Review of previous chest examinations including a chest CT dated ___ indicates that the patient had multiple parenchymal densities on the lung bases , as shown on previous CT . There was no evidence of new masses or discrete pneumonic processes .
    OUTPUT:
    
Increased pulmonary vascular pattern clearly developing during the latest four and a half hours examination interval . Increased circulating blood volume can explain the increased pulmonary vascular pattern . The suggested finding of perivascular haze on the lung bases indicates some element of left - sided failure in this patient with history of previous bypass surgery and chronic moderate cardiac enlargement . Clinical measures to accomplish dehydration appear indicated and followup chest examination can be used to monitor the success .