Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate unremarkable cardiomediastinal and hilar contours . Mild asymmetry of the lung bases likely reflects atelectasis . No pulmonary nodules identified . Small left pleural effusion noted . No pneumothorax present . Mild dextroscoliosis of the thoracic spine evident .
    OUTPUT:
    
No pulmonary nodules . Small left pleural effusion .