Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are decreased lung volumes . Volume loss with resultant increased opacification is seen within the left lower and right middle lobes , likely related representing atelectasis . A small left pleural effusion is seen . There is no focal consolidation , pneumothorax , or pulmonary edema . There is mild enlargement of the cardiomediastinal silhouette , although this may be exaggerated due to the AP projection and decreased lung volumes .
    OUTPUT:
    
1 . Probable atelectasis at the left lower and right middle lobes . 2 . Small , left pleural effusion .