Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There are relatively low lung volumes , which accentuate the bronchovascular markings . Patient is status post median sternotomy and CABG . Bibasilar atelectasis . Opacity projecting over the left lung base , possibly involving a rib , is more prominent compared to prior On the lateral view , prominent costochondral calcification is seen ; however , the inferior aspect of the sternum , while not well assesssed , appears mottled and heterogeneous . Given history of prostate cancer , findings could relate to metastases . Recommend further evaluation with cross - sectional imaging or bone scan . There is no pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
An area of relative increased opacity at the left lung base could in part relate to prominent costochondral calcification . This is more prominent as compared to ___ with the sternum appearing relatively mottled and heterogeneous on lateral view of chest , given history of prostate cancer , metastasis is in the differential and further evaluation with cross - sectional imaging or bone scan is recommended .