Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is at the upper limits of normal , likely the exaggerating effects of low lung volumes . The mediastinal contours demonstrate subtle calcified atherosclerotic disease of the aortic knob . The hilar contours are normal . The lungs are clear but with slightly decreased volumes . There is no pleural effusion or pneumothorax . Prominence of the chest wall about the sternomanubrial / sternoclavicular joints on the lateral view is of unclear etiology , possibly calcified costochondral cartilage , degenerative change , or a pleural / osseous lesion .
    OUTPUT:
    
1 . Low lung volumes with no acute cardiopulmonary process . 2 . New indeterminate anterior chest wall lesion ; CT may be considered .