Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increased prominence of the mediastinum which could be due to differences in patient position and AP technique , underlying lymphadenopathy not excluded . Patchy left base opacity is worrisome for pneumonia versus atelectasis . No pleural effusion or pneumothorax is seen . The cardiac silhouette is top - normal .
    OUTPUT:
    
Patchy left base opacity could be due to pneumonia or atelectasis . There is increased prominence of the mediastinum which could relate to patient positioning however underlying mediastinal lymphadenopathy is not excluded . Dedicated PA and lateral views with better patient positioning may be helpful for further evaluation .