Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright frontal chest radiograph was obtained . Left chest wall ICD is again noted with leads in proper position and unchanged compared to the prior study . Cardiomediastinal contours are unchanged . Lungs demonstrate low volumes with crowding of the vessels centrally and streaky bibasal opacities most consistent with atelectasis . There is no focal area of consolidation . No large effusions or pneumothorax . Sternotomy wires and surgical clips along the midline are also noted .
    OUTPUT:
    
No evidence of pneumonia .