Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Superimposed trauma board limits detailed evaluation . The heart is of normal size with normal cardiomediastinal contours . There is calcification of the aortic knob . A 1 .4 - cm calcified round opacity overlying the left lung base may represent a chondral calcification , but a pulmonary nodule can not be excluded . Lungs are otherwise clear . No pleural effusion or pneumothorax . A coronary stent is noted along the left heart border . There are multilevel degenerative changes along the spine .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Calcified rounded opacity overlying the left lung base may be a chondral calcification . Non-emergent PA and lateral views may be obtained for confirmation after patient stabilization .