Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . There is mild similar unfolding of the thoracic aorta . The mediastinal and hilar contours appear unchanged . There is a newly apparent nodular density at the left lung apex measuring about a centimeter in diameter and of unclear etiology , although potentially a lung nodule . Otherwise , the lungs appear clear . There is no pleural effusion or pneumothorax . Slight degenerative changes are noted along the mid thoracic spine .
    OUTPUT:
    
No evidence of acute disease . Nodular density projecting over the left lung apex , of uncertain significance , but potentially a true lung nodule . When clinically appropriate , evaluation with chest CT is recommended to assess further . Findings and recommendations discussed with Dr . ___ at 1 : 40 am on ___ , by telephone .