Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is at the upper limits of normal . The mediastinal contours demonstrate calcified atherosclerotic disease of the aortic knob with a tortuous aortic contour . There is no mediastinal widening . The lungs are clear of consolidation . There is no pneumothorax . There is no large pleural effusion ; subtle blunting of the posterior aspect of the left costophrenic angle may represent trace pleural fluid .
    OUTPUT:
    
Possible trace left pleural effusion , but otherwise no acute cardiopulmonary process .