Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged , including calcification of the aortic arch and slightly prominent heart size , although probably overall within normal limits , but with a left ventricular configuration . There is no clear evidence for pleural effusion or pneumothorax . There are patchy opacities in the left lower lobe , not present on earlier radiographs from ___ and increased from ___ , superimposed on streaky lingular atelectasis . However , there are no findings suggestive of pulmonary edema .
    OUTPUT:
    
Focal left basilar opacity , which appears superimposed on preexisting lingular atelectasis and probably within the medial left lower lobe with air bronchograms . Differential considerations , include included atelectasis ; in the appropriate clinical setting , pneumonia is not excluded , however . Correlation with other patient factors is suggested .