Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with prior radiographs on ___ , there is improvement in both the right and left lung interstitial markings . There is no pleural effusion or pneumothorax . There is no vascular congestion or edema . There is no evidence to suggest or exclude pulmonary embolism . Again seen is chronic elevation of the right hemidiaphragm with a loop of large bowel beneath the diaphragm .
    OUTPUT:
    
Improvement in both right and left lung interstitial markings compared with ___ , however as no recent radiographs are available for comparison prior to the onset of patient symptoms 3 weeks ago , superimposed infection can not be excluded .