Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated and clear . The cardiac silhouette appears slightly increased compared to prior study but likely secondary to underinflation . A focal opacity projecting over the left lung base is a soft tissue artifact . No free air seen under the diaphragm . Osseous structures are grossly intact .
    OUTPUT:
    
No evidence of acute cardiopulmonary process . No pneumoperitoneum .