Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Left basilar linear density is most compatible with atelectasis . There are multiple left rib fractures which appear subacute as these were present on the prior CT from outside hospital performed ___ . These appear to involve the left fifth through ninth ribs posterolaterally , all of which appear mildly displaced . There is no pneumothorax . No large effusion . Right lung is clear . Cardiomediastinal silhouette is stable .
    OUTPUT:
    
Multiple mildly displaced left rib fractures as seen on the recent chest CT . Mild left basal atelectasis . No pneumothorax .