Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The major airways are patent but appears slightly decreased in diameter compared to previous imaging done ___ ( this may be technical in nature ) . Airspace opacification in the left lower lobe is increased compared to previous imaging . No pneumothorax . No pleural effusion . The cardiomediastinal shadow is normal . The airspace opacification in the right lower lung zone has resolved .
    OUTPUT:
    
Interval progression of the acute pneumonic process in the left lower lobe . No associated effusion or hilar adenopathy .