Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable semi-erect frontal chest radiograph demonstrates a central catheter with the tip in the low SVC / cavoatrial junction , multiple sternal wires , a valvular prosthesis , and surgical hardware . There is mild - to - moderate cardiomegaly and mild interstitial edema . No focal consolidation is definitely seen , although the lower lungs are difficult to evaluate secondary to bibasilar atelectasis and left greater than right small pleural effusions , unchanged from the prior study . There is no pneumothorax .
    OUTPUT:
    
Mild interstitial edema , bibasilar atelectasis , and left greater than right small to moderate pleural effusions . No focal consolidation definitely seen , although the lower lungs are difficult to evaluate .