Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . There is chronic elevation of the right hemidiaphragm . Cardiac silhouette size appears mild to moderately enlarged , as seen previously . The mediastinal contour is similar . Hilar contours are relatively unchanged with no evidence for pulmonary edema . Patchy opacity in the right lung base likely reflects an area of atelectasis , but infection is not excluded in the correct clinical setting . Minimal atelectasis is also noted in the retrocardiac region . There may be a trace right pleural effusion . No pneumothorax is identified , though assessment of the medial aspect of the lung apices is somewhat obscured by the patient 's chin overlying this area . No acute osseous abnormality is visualized .
    OUTPUT:
    
Low lung volumes with patchy opacity in the right lung base , likely atelectasis , but infection is not excluded in the correct clinical setting . Possible trace right pleural effusion . Chronic elevation of the right hemidiaphragm .