Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . There is new opacity identified at the left cardiophrenic angle not seen on prior . The lungs are otherwise clear . There is no effusion or pulmonary vascular congestion . The cardiomediastinal silhouette is normal . No acute osseous abnormalities detected .
    OUTPUT:
    
New opacity at the left cardiophrenic angle could potentially represent atelectasis however infection can not be entirely excluded . Otherwise unremarkable chest x-ray .