Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiograph demonstrates increased opacity within the left lower lung zone with obscuration of the left heart border . Patient is rotated to his left . There appears to be probable central vascular congestion with probable mild pulmonary edema . The right costophrenic angle is clear . No definite pleural effusion is seen on the lateral view . A left chest heart device is in similar configuration relative to prior studies . There is no pneumothorax .
    OUTPUT:
    
New left lower lung zone opacification for which etiology includes infectious process or alternatively sequela of aspiration . Increased perihilar opacities suggest central vascular congestion and mild pulmonary edema .