Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate persistent linear atelectasis at the lung bases . Otherwise , no focal consolidation , pneumothorax or pulmonary edema is present , however on the lateral radiograph there is possible opacity projecting over the posterior mid-thoracic spine which could reflect super - imposed shadows . The cardiomediastinal silhouette is stable in appearance . The patient is status post median sternotomy . No pleural effusion is identified .
    OUTPUT:
    
No definite acute cardiopulmonary process . Possible opacity projecting over the posterior mid-thoracic spine could reflect super - imposed shadows . Repeat lateral radiograph is recommended .