Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest , PA and lateral . The lung bases appear dense especially on the left and on the lateral . This is unchanged from the prior study and may be related to insufficient inspiration . The lungs are otherwise clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
No acute cardiopulmonary process .