Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal radiograph of the chest when compared to the prior study demonstrates continued elevation of left hemidiaphragm with left basilar atelectasis . The cardiac and mediastinal contours are unchanged . Scarring in the right apex is of unclear etiology and may be a sign of prior tuberculosis infection or post-radiation fibrosis . No pleural abnormality .
    OUTPUT:
    
1 . Bibasilar atelectasis with pulmonary vascular congestion and no evidence of developing pneumonia . 2 . Right apical scarring which is of unclear etiology . Correlation with prior imaging is recommended and if not available , CT of the chest can be obtained for further evaluation .