Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube tip is slightly low lying , terminating approximately 2 .4 cm from the carina . Cardiac , mediastinal and hilar contours are normal . Opacity in the left lung base likely reflective of atelectasis . No large pleural effusion or pneumothorax is demonstrated on this supine exam . There is no pulmonary vascular congestion . No acute osseous abnormalities are detected .
    OUTPUT:
    
Slightly low lying endotracheal tube , with tip terminating approximately 2 .4 cm from the carina . Atelectasis in the left lung base .