Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable chest radiograph demonstrates an similar appearance to ___ . The intervening examination performed the same day as the current study demonstrates dense increased opacification in the left lung base ; however , the degree of density as well as the contour suggests that this is an elevated left hemidiaphragm as opposed to new large subpulmonic pleural effusion . There may be a small left effusion . The remaining massive cardiomediastinal silhouette enlargement is stable . Significant perihilar opacifications most marked on the left is concerning for malignancy . No pneumothorax identified .
    OUTPUT:
    
No pneumothorax . Possible tiny left pleural effusion . Unchanged massive enlargement of the cardiomediastinal silhouette and adjacent significant opacification , the latter concerning for left perihilar mass .