Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left upper lung opacity is unchanged , with maximal diameter of 3 .3 cm . The lung is otherwise well inflated and clear . Cardiomediastinal silhouette is normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Persistent left upper lung opacity , no sign of complication after VATS procedure .