Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two portable views of the chest are compared to previous exam from ___ . As on prior , there is increased retrocardiac opacity which partially silhouettes the hemidiaphragm . Elsewhere , the lungs are clear of confluent consolidation . Calcified granulomas are identified over the left upper lung . Costophrenic angles are sharp . Cardiomediastinal silhouette is stable as are the osseous and soft tissue structures .
    OUTPUT:
    
Retrocardiac opacity which could be due to either atelectasis versus consolidation . Two - view chest may help further characterize .