Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable single frontal chest radiograph was obtained with the patient in semi-upright position . There are increased opacities in the left lung base . The pulmonary vasculature is moderately engorged . No pleural effusion or pneumothorax is seen . When compared to prior study , there is mild increase in heart size . Mediastinal contours are stable .
    OUTPUT:
    
1 . Pulmonary vascular congestion . 2 . Increased opacity in the left lower lung base , which may reflect asymmetric edema or aspiration pneumonitis .