Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Mediastinal contours and heart borders are normal . Elevated left hemidiaphragm without clear explanation in the chest . Small left and tiny right pleural effusions . Retrocardiac opacity likely is either hiatus hernia or tortuous lower thoracic aorta .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Small left and tiny right pleural effusions . 3 . Elevated left hemidiaphragm without clear explanation in the chest .