Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . 5 mm nodular density projects over the left upper lobe , at the intersection of the first anterior rib and clavicle . Lungs are otherwise clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
1 . 5 mm nodular density projecting over the left upper lobe , at the intersection of the first anterior rib and clavicle . This could be within the bone or a pulmonary nodule . Consider shallow oblique images for further assessment . 2 . No acute cardiopulmonary abnormality .