Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The aorta remains tortuous . Hilar contours are similar , with enlargement of the main pulmonary artery suggestive of pulmonary arterial hypertension . Linear opacities in the lung bases likely reflect areas of atelectasis . Lungs remain hyperinflated . No focal consolidation , pleural effusion or pneumothorax is present . 8 mm nodular opacity within the left mid lung field is new compared to the prior exams . Posterior spinal fusion hardware is partially visualized within the upper thoracic spine .
    OUTPUT:
    
No evidence of pneumonia . New 8 mm nodular opacity within the left mid lung field . This could reflect a metastasis and can be better assessed with chest CT .