Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Bibasilar atelectasis is noted . No convincing evidence for pneumonia . Cardiomediastinal silhouette is stable with mild cardiomegaly again seen . No pneumothorax or effusion . Bony structures appear grossly intact with degenerative spurring in the thoracic spine .
    OUTPUT:
    
Bibasilar atelectasis . Mild cardiomegaly . No convincing evidence for pneumonia .