Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is heterogeneous left perihilar opacification and greater hilar fullness compared to prior chest radiograph from ___ , of indeterminate etiology . There is no pleural effusion . No pneumothorax . There is no central vascular congestion or overt pulmonary edema The cardiomediastinal silhouette is normal .
    OUTPUT:
    
Heterogeneous left perihilar opacification and greater hilar fullness compared to prior study , for which chest CT is recommended for further evaluation .