Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right PICC terminating in the low SVC and an ICD / pacemaker are unchanged . There is no change in the right perihilar opacity , which based on the subsequent CT , is consistent with edema . The other areas of moderate pulmonary edema have slightly improved . There is no new opacity . There is no pleural effusion or pneumothorax . The cardiac size remains moderately enlarged . The mediastinal contours are normal .
    OUTPUT:
    
Slight interval improvement in the moderate pulmonary edema .