Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest were obtained . The heart size and mediastinal contours are normal . A 13 mm rounded opacity projecting over the right heart on the frontal view possibly corresponding to a rounded opacity seen retrosternal on the lateral view . The lungs are well expanded and clear . No pleural effusion or pneumothorax is present .
    OUTPUT:
    
13 mm round opacity projecting over the right heart possibly corresponding to a retrosternal opacity on the lateral view could potentially be a pulmonary ___ on end but can be further evaluated with nonemergent chest CT .