Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right IJ sheath overlies the mid SVC . The patient is status post sternotomy , with prominence of the cardiomediastinal silhouette . There are diffuse increased interstitial markings -- some of this is probably vascular , reflecting CHF , but the possibility of underlying interstitial changes can not be excluded . The right hemidiaphragm is slightly better defined . No gross effusion is identified . No pneumothorax is detected . Stool noted in descending colon .
    OUTPUT:
    
No gross change compared with 1 day prior , allowing for technical differences . Diffuse prominence of vessels and interstitial markings likely represent CHF , though the preoperative film also showed some background interstitial changes suggestive of fibrosis . Please note that in this setting , a superimposed interstitial infectious process would be difficult to exclude .