Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette is stable , with an abnormal contour at the level of AP window and to the right lower paratracheal stripe reflective of known FDG avid mediastinal mass . Aortic arch calcifications are re- demonstrated . There is no new focal lung consolidation . There is no pulmonary vascular congestion or pulmonary edema . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
1 . Abnormality of the cardiomediastinal contour is consistent with known mediastinal FDG avid mass , better evaluated on prior PET - CT from ___ . 2 . No evidence of superimposed acute cardiopulmonary process . No focal lung consolidation .