Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There may be a very trace right pleural effusion . No large pleural effusion is seen . The patient is status post median sternotomy and CABG . The cardiac and mediastinal silhouettes are stable with the cardiac silhouette moderately enlarged . No pulmonary edema is seen . No pneumothorax is seen . On the lateral view , projecting over the posterior aspect of ___ mid thoracic vertebral bodies , there is a somewhat rounded opacity measuring 2 cm . While findings may be osseous in nature , it is more conspicuous as compared to the prior study , and underlying pulmonary lesion is not excluded . Recommend chest CT for further assessment .
    OUTPUT:
    
On the lateral view , projecting over the posterior aspect of ___ mid thoracic vertebral bodies , there is a somewhat rounded opacity measuring 2 cm . While findings may be osseous in nature , it is more conspicuous as compared to the prior study , and underlying pulmonary lesion is not excluded . Recommend chest CT for further assessment . Possible very trace pleural effusion . Persistent cardiomegaly without pulmonary edema .