Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the most recent available chest radiograph from ___ , a new vague left midlung zone opacity is present , not well localized on the lateral view , which may denote focal atelectasis in the setting of low lung volumes , but a small consolidation can not be excluded . Again seen is a background of coarse interstitial markings which are minimally changed . There is no pneumothorax or pleural effusion . Mild cardiomegaly is unchanged . The hilar and mediastinal contours remain stable .
    OUTPUT:
    
1 . Vague left midlung opacity which may represent a small consolidation . Chest CTA is pending at the time of interpretation . 2 . Mild cardiomegaly .