Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly with tortuous thoracic aorta and mild prominence of the right mediastinal contour is unchanged compared to prior examination . Hilar contours are unremarkable . Lung volumes are low accentuating the cardiac silhouette and causing crowding of the bronchopulmonary vasculature ; however , there is no overt fluid overload . Lungs are otherwise clear with the exception of linear streaky atelectasis at the left lung base . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality .