Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent subsegmental atelectasis in the right lung base . Otherwise , the lungs are well - expanded and clear . The cardiomediastinal silhouette is unremarkable . A nipple shadow is noted on the left . Hilar and pleural surfaces are unremarkable . Pulmonary vasculature is normal . No acute osseous abnormalities demonstrated .
    OUTPUT:
    
No radiographic evidence for pneumonia . Persistent subsegmental right basilar atelectasis .