How would you treat a patient with rectal cancer with a solitary lung metastasis, who now has no evidence of disease after total neoadjuvant therapy followed by rectal surgery and resection of the solitary metastasis?  

Surveillance! Assuming this patient received “complete” total neoadjuvant therapy with at least 3-4 months of systemic therapy, preoperative radiotherapy to the pelvis and curative intent operations to the pelvis and lung with no evidence of residual disease on post-op imaging- this is t...