Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are relatively low lung volumes . Large opacity projecting over the left mid to lower lung fields with subtle air bronchograms seen is worrisome for pneumonia . No definite pleural effusion is seen , although small left pleural effusion is difficult to exclude . The right lung is clear . There is no pneumothorax . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Large left lower lobe consolidation worrisome for pneumonia .