Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is new volume loss and atelectasis at the left base with associated mild elevation of the left hemidiaphragm . There is no focal opacity to suggest pneumonia . There is no pulmonary edema , pleural effusion , or pneumothorax . The mediastinal contours are normal . The heart size is moderately enlarged , and allowing for changes in technique , unchanged from the prior exam .
    OUTPUT:
    
1 . No pneumothorax . 2 . Left basilar atelectasis . 3 . Unchanged cardiomegaly .