Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The hemodialysis catheter is unchanged in position with the tip in the right atrium . Low lung volumes result in bronchovascular crowding . There is no focal consolidation , pleural effusion or pneumothorax . Mild - to - moderate cardiomegaly is unchanged . Mediastinal silhouette and hilar contours are stable allowing for lung volumes .
    OUTPUT:
    
No pneumonia , edema , or effusion .