Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs were obtained . The lungs are well inflated . There is a 1 .5 cm density projecting over the head of the left clavicle . There is no consolidation , effusion or pneumothorax . Cardiac and mediastinal contours are normal .
    OUTPUT:
    
1 .5 cm density projecting over the left clavicular head may represent focal pulmonary nodule or sternoclavicular joint degenerative change . Chest CT is recommended for further evaluation . This recommendation was entered into the online critical results reporting tool at 17 :00 on ___ .