Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart and mediastinal contours appear normal . The lungs are clear . There is no pleural effusion or pneumothorax . Again is noted in the left apex , a rounded mass , better characterized on CT from ___ .
    OUTPUT:
    
Left apical mass ; no evidence of pneumothorax or pneumomediastinum ; no pleural effusion .