Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heterogeneous opacification of the left upper lobe in the paramediastinal region likely reflects combination of bronchiectasis and consolidation , and obscures the aortic knob . The right lung is clear . The cardiomediastinal silhouette is within normal limits . There is a small left pleural effusion . No pneumothorax .
    OUTPUT:
    
1 . Heterogeneous opacification of the left upper lobe . This may represent infection , including TB . Chest CT is recommended for further evaluation . 2 . Small left pleural effusion .