Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is enlarged . Upper mediastinal contours are normal . Heterogeneous opacity in the left upper lobe is consistent with infection . The right lung is clear . There is slight blunting of the left costophrenic angle . No pneumothorax .
    OUTPUT:
    
1 . Left upper lobe opacity consistent with infection . 2 . Cardiomegaly .