Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Postoperative changes the right hemi thorax are again seen . Previously characterized underlying mass lesion in the suprahilar region is not clearly delineated . Spiculated lesion at the right lung base is not particularly well assessed but similar compared to prior . The left lung is clear . The cardiomediastinal silhouette is stable . No acute osseous abnormalities .
    OUTPUT:
    
Postoperative changes . Known mass not clearly delineated . No definite superimposed acute cardiopulmonary process .