Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are unremarkable . Pulmonary vascularity is normal . Streaky opacity in the left lung base likely reflects mild atelectasis . No focal consolidation , pleural effusion or pneumothorax is visualized . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild left basilar atelectasis . No intrathoracic malignancy identified .