A 48-year-old otherwise healthy woman has undergone a laparoscopic low anterior resection (LAR) and completed 12 cycles of adjuvant FOLFOX for a near-obstructing pT3N2M0 rectosigmoid cancer. On surveillance imaging, she is found to have a peripheral solitary 3-cm right lower lobe lung lesion. No other metastasis is identified. What is the best next step in her management?