Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Midline sternotomy wires and mediastinal clips are again noted . There is a right chest wall Port - A - Cath with its tip in the mid SVC . A calcific density in the region of the AP window corresponds with a calcified lymph node on prior CT . Lung volumes are low limiting evaluation . There is bibasilar atelectasis with bronchovascular crowding . No convincing signs of pneumonia though evaluation is limited . No large effusion or pneumothorax . Heart size is difficult to assess . Mediastinal contour is stable . Bony structures are intact .
    OUTPUT:
    
Limited exam with given low lung volumes with bibasilar atelectasis , difficult to exclude a superimposed pneumonia .