Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable AP radiograph of the chest demonstrates no marked change from the prior study performed 9 hours earlier . There is persistent right lower lobe atelectasis and lungs are otherwise clear . There is no pneumothorax or pleural effusion . The hilar and cardiomediastinal contours are normal . Annular calcification of the mitral valve is seen . There are calcified left pleural plaques . A right internal jugular central venous catheter terminates in the low SVC and a drain can be seen in the right upper quadrant of the abdomen . The pulmonary vascularity is normal , and there is no edema .
    OUTPUT:
    
No evidence of pneumonia or congestive heart failure . Stable right lower lobe atelectasis .