Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs the chest demonstrate low lung volumes with resulting bronchovascular crowding . There is an area of increased retrocardiac opacity , concerning for left lower lobe pneumonia . There is mild vascular congestion . The cardiomediastinal and hilar contours are unchanged . There is no pneumothorax , or pleural effusion .
    OUTPUT:
    
1 . Increased retrocardiac opacity , concerning for left lower lobe pneumonia . 2 . Mild vascular congestion .