Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are obtained . There is mild atelectasis at the left lung base . The previously seen endotracheal tube and nasogastric tube are no longer present on this study . There is no evidence of pneumonia , pleural effusion or pulmonary edema . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
No acute cardiopulmonary disease . Mild atelectasis of the left lung base .