Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate top normal heart size and normal mediastinal and hilar contours . The thoracic aorta is mildly tortuous . The lungs are clear . There is no pneumothorax , vascular congestion , or pleural effusion . Trace left greater than right basilar atelectasis is present . There is no radiographically appreciable peribronchial cuffing . The airway is midline .
    OUTPUT:
    
No evidence of pneumonia . Trace left basilar atelectasis .