Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to prior , there has been interval progression of the opacity in the left upper lobe . Hazy opacity in the left lung base corresponds with lingular atelectasis versus scarring and superimposed left lower lobe ground - glass seen on prior chest CT . Additional nodules previously described are not as clearly delineated by x-ray . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities . Surgical clips in the right upper quadrant suggest prior cholecystectomy .
    OUTPUT:
    
Left upper lobe consolidation has progressed since prior . This could be due to an infection however underlying malignancy can not be excluded . Follow - up by chest CT is suggested and can be performed as previously recommended in ___ .