Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The patient is status post median sternotomy and CABG . A possible broken needle fragment projects over the trachea and is unchanged as compared to the prior study . There is left base atelectasis / scarring . There is slight blunting of the posterior left costophrenic angle and a trace pleural effusion is not excluded . No focal consolidation is seen . There is no pneumothorax . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Slight blunting of the posterior costophrenic angle , trace pleural effusion not excluded . Left base atelectasis / scarring .