Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There are low lung volumes . There is prominence and indistinctness of the hila and prominent interstitial markings raising concern for mild edema . No pleural effusion or definite focal consolidation is seen . The cardiac silhouette is mildly enlarged . The aorta is calcified and tortuous . Patient is status post median sternotomy and CABG .
    OUTPUT:
    
Low lung volumes and mild fluid overload .