Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low which result in crowding of the bronchovascular structures . There is no focal consolidation or pneumothorax . Linear opacities at the right base are most likely atelectasis . There is blunting of the costophrenic angles , slightly worse on the left , possibly due to small pleural effusions or pleural thickening . A curvilinear thin radio - opaque density , possibly a wire , is seen projecting over the right hilus . An apparent inferior epicardial wire is unchanged . The cardiomediastinal silhouette is similar to the prior study with mild cardiomegaly . A large hiatal hernia is present . The patient is status post median sternotomy and CABG . Osseous structures are intact .
    OUTPUT:
    
1 . Low lung volumes with atelectasis at the bases . 2 . Thin curvilinear radio - opaque density projecting over the left hilus , new from prior exams . Chest CT is recommended for further evaluation .