Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . There is a 0 .6 cm nodule in the left upper lobe . Lungs are otherwise clear , except for bibasilar atelectasis . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . There are degenerative changes of visualized spine .
    OUTPUT:
    
1 . There is a 0 .6 cm nodule in the left upper lobe , potentially a calcified granuloma but not fully characterized by conventional radiographs . Recommend comparison to prior imaging to assess stability . If these are not available for comparison , recommend noncontrast CT of the chest for further evaluation . 2 . Bibasilar atelectasis . No evidence of pneumonia , as clinically questioned .