Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . In the lateral view there is a 2 .5 cm focal opacity in the anterior mediastinum abutting the anterior thoracic wall in the retrosternal clear space . This likely localizes in the infrahilar location on the frontal view localizing to the region the anterior left fourth rib . There is also a 1 .3 cm nodule projecting over the left midlung laterally . Smaller nodules also seen in the left lung more inferiorly . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No definite acute cardiopulmonary process . Focal opacity in the retrosternal clear space localizing to the anterior fourth rib . Additional nodular opacity in the left lung for which chest CT suggested to further characterize , not necessarily acutely .