Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are normal . There are bilateral reticular opacities , right greater than left , which may reflect underlying chronic lung disease or lymphangitic carcinomatosis , underlying infection not excluded . No pleural effusion or pneumothorax . Heart size is mildly enlarged . Osseous structures are heterogeneous in appearance and difficult to fully assess . Note is made of a 1 .2 cm sclerotic focus in the left proximal humerus , which may represent a bone island but metastatic disease is not excluded .
    OUTPUT:
    
1 . Diffuse reticular opacities , more confluent in appearance at the right lung base . These findings may be due to a combination of chronic lung disease , lymphangitic carcinomatosis , with superimposed infection not excluded . 2 . 1 .2 cm sclerotic focus in the left proximal humerus , which may represent a bone island or metastatic lesion . Dedicated imaging could be performed on a nonurgent basis , if priors are not available for comparison .