Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evaluation is limited by suboptimal inspiratory effort . Lungs are grossly clear . There is no pneumothorax . Mild cardiomegaly is unchanged . Although the right hilus appears slightly more dense than on the prior exam , this is likely due to vascular crowding .
    OUTPUT:
    
Grossly clear lungs with no evidence of pneumonia .