Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right tunneled hemodialysis catheter is unchanged in position with its tip in the right atrium . The heart remains severely enlarged . The lungs are well expanded and clear . There is no pleural effusion , or pneumothorax . The mediastinal contours are normal .
    OUTPUT:
    
Severe cardiomegaly is unchanged , there is no edema or acute chest abnormality .