Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouettes are stable , again demonstrating likely moderate cardiomegaly . There are low lung volumes , with crowding of normal bronchovascular structures . Left mid lung airspace opacity , in addition to left retrocardiac opacification , is concerning for developing pneumonia . There is no evidence of pulmonary vascular congestion or pulmonary edema . A small left pleural effusion is difficult to exclude . There is no right pleural effusion . There is no pneumothorax .
    OUTPUT:
    
Low lung volumes . Left lower lobe airspace opacities may represent developing pneumonia . Consider repeat chest radiograph with and improved inspiratory effort .