Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear . Cardiomediastinal silhouette and hilar contours are unremarkable . There is no evidence of focal opacity concerning for an infectious process . No pleural effusion or pneumothorax . Previously identified Bochdalek hernia is again noted on the lateral film , measuring 6 .2 x 6 .1 cm .
    OUTPUT:
    
No acute findings .