Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well - expanded . A 0 .9 x 0 .3 cm opacity is seen projecting over the left lower lobe and may represent nipple shadow or a pulmonary nodule . Lungs are otherwise clear . Enlarged left pulmonary hilum is new since previous examination . Heart size , mediastinal contour , and right hilum are unremarkable . No pleural effusion or pneumothorax . Limited assessment of the osseous structures are within normal limits and upper abdomen is unremarkable .
    OUTPUT:
    
1 . 0 .9 cm left lower lobe opacity may represent nipple shadow or pulmonary nodule . 2 . Enlarged left pulmonary hilum is new since previous examination and worrisome for lymph node enlargement . Consider dedicated CT for further characterization . 3 . No definite pneumonia .