Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top normal , but slightly increased in size compared to the prior exam . The mediastinal contours are unremarkable . Streaky linear opacities in both lung bases with evidence ___ ___ B - lines may reflect mild interstitial pulmonary edema , though an infectious process can not be completely excluded . No pleural effusion or pneumothorax is identified . The mediastinal contours are unchanged .
    OUTPUT:
    
Bibasilar linear and streaky airspace opacities likely reflect mild interstitial pulmonary edema , though an atypical infection can not be completely excluded . Recommend followup radiographs after diuresis .