Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of the cardiac silhouette is unchanged . The aorta remains mildly tortuous . The hilar contours are within normal limits . Pulmonary vasculature is not engorged . Patchy opacities in the lung bases may reflect atelectasis . Focal nodular opacity measuring approximately 10 mm projecting over the left third rib anteriorly is not clearly localized on the lateral view , but appears thickened present on the previous exam projecting over the left lung base . No acute osseous abnormality is clearly noted . There is mild loss of height of an upper lumbar vertebral body , unchanged .
    OUTPUT:
    
1 . Patchy bibasilar airspace opacities , potentially atelectasis , but infection can not be excluded in the correct clinical setting . 2 . Vague 10 mm nodular opacity projecting over the left third rib anteriorly was likely present on the previous chest radiograph . Assessment with nonemergent chest CT is recommended for further evaluation .