Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to recent chest x-ray there has been no significant interval change . Opacity in the left hilar / infrahilar region is compatible with patient 's known malignancy . There is no new focal consolidation . No large effusion . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
Known left perihilar malignancy without superimposed acute cardiopulmonary process .