Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . There is interval increase in ground - glass opacities involving the bilateral lower lungs which is concerning for interval progression of bronchoalveolar carcinoma though the possibility of a superimposed pneumonia is impossible to exclude . No large effusions or pneumothorax . Cardiomediastinal silhouette is normal . Bony structures appear grossly intact .
    OUTPUT:
    
Worsening mid to lower lung ground - glass opacities which may reflect worsening bronchoalveolar carcinoma versus superimposed pneumonia . Recommend followup post - treatment films .