Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . A 6 mm nodular opacity projecting over the left lung base is seen on the frontal projection . Otherwise , the lungs appear clear . No pleural effusion or pneumothorax is seen . The heart and mediastinal contours appear normal . The imaged osseous structures appear intact . No free air is seen below the right hemidiaphragm .
    OUTPUT:
    
Nodular opacity projecting over the left lung base ; nonemergent CT chest may be performed to further assess .