Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest were obtained . The lungs are clear . No signs of pulmonary edema or pneumonia . Mild left basilar atelectasis is noted . No pleural effusion . Cardiomediastinal silhouette is normal . Bony structures are intact . There is an old left sixth posterior rib deformity .
    OUTPUT:
    
No acute intrathoracic process . Specifically , no signs of pulmonary edema .