Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior radiograph performed approximately one day earlier , the opacity at the right medial base has increased in density . Additionally , a new opacity at the left base is present . These are likely atelectasis given the low lung volumes , although aspiration or pneumonia are considerations . There is no pulmonary edema , pleural effusion , or pneumothorax . The widened mediastinum is unchanged from the prior exam . The cardiac silhouette is normal . An endotracheal tube is 4 .7 cm from the carina . An NG tube courses below the diaphragm with the tip out of the field of view . This is new from the prior exam .
    OUTPUT:
    
1 . Probable bibasilar atelectasis ; in the proper clinical setting , pneumonia or aspiration can not be excluded . 2 . Stable widened mediastinum . If concern for aortic pathology or mediastinal lymphadenopathy exists , further evaluation with a chest CT could be obtained . Results were discussed with Dr . ___ ( MICU resident ) at 10 :45 a .m . on ___ via telephone by Dr . ___ .