Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . Left basilar atelectasis is noted . The known hiatal hernia is poorly assessed . No definite signs of pneumonia or CHF . Cardiomediastinal silhouette appears grossly unremarkable . Bony structures are intact .
    OUTPUT:
    
Left basilar atelectasis . Poor visualization of known hiatal hernia .