Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest were acquired . There has been interval removal of a right PICC . There is evidence of prior CABG including intact midline sternotomy wires and scattered mediastinal surgical clips . Lung volumes are low , decreased compared to the prior study from ___ . There is pulmonary vascular congestion with mild interstitial pulmonary edema . Additionally , there are new dense opacities at the left lung base , possibly related to prominent vascular structures , although pneumonia is not excluded . Mild enlargement of the cardiac silhouette is not significantly changed . Mediastinal contours are unchanged . There are no definite pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
1 . Heterogeneous left lower lung opacities could be partially related to prominent pulmonary vasculature , although infection in this region is not excluded . 2 . Pulmonary vascular congestion with mild interstitial pulmonary edema . 3 . Unchanged mild cardiomegaly .