A 25-year-old is seen in the clinic for assessment of an incidental finding on a CXR of a 2-cm solitary pulmonary nodule in the left lower lobe. He feels well and reports no dyspnea, chest pain, or constitutional symptoms. He does not smoke and has never had a previous CXR. The physical examination is completely normal. The nodule has a "popcorn ball"-type calcification pattern. Which of following is the most appropriate next step in management?