Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior study , there has been interval development and right middle lobe opacity which may be due to consolidation from a right middle lobe pneumonia , underlying pulmonary lesion not excluded . The left lung is clear . No pleural effusion or pneumothorax is seen . The cardiac size remains top - normal to mildly enlarged . Mediastinal contours are stable .
    OUTPUT:
    
Right middle lobe opacity may be due to consolidation due to pneumonia , underlying pulmonary lesion not excluded .