Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are slightly lower lung volumes with improved aeration and resolution of previously seen pulmonary edema . Azygos vein is no longer dilated . There is a persistent dense retrocardiac opacity which correlates with left posterior consolidation seen in the left hemithorax . This finding may represent aspiration , however , pneumonia can not be excluded in the appropriate clinical setting . There is stable cardiomegaly with no evidence of failure . Right IJ catheter is seen in position terminating within the low SVC .
    OUTPUT:
    
1 ) Slightly lower lung volumes than previous study , however , there is improved aeration and resolution of pulmonary edema . 2 ) Persistent left posterior opacity may represent pneumonia , pleural effusion , or aspiration . These findings were discussed with Dr . ___ in person by ___ at 12 :05 p .m .