Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lordotic positioning . Moderate cardiomegaly with unfolding of the thoracic aortic arch . Allowing for technical differences , the cardiomediastinal silhouette is in keeping with findings on the radiograph from ___ . Upper zone redistribution , without overt CHF . Possible atelectasis at the left base . No definite consolidation . Lung volumes appear low on the frontal view due to patient positioning . No pleural effusion or pneumothorax .
    OUTPUT:
    
Cardiomegaly and upper zone redistribution , probably unchanged compared with ___ . No definite consolidation . Possible atelectasis at the left base posteriorly .