A 74-year-old man with no respiratory or abdominal symptoms was diagnosed with a non-hyperplastic polyp in the cecum during a follow-up gastrointestinal procedure.
The polyp was found to be small cell carcinoma with positive margins, and further testing revealed a lung mass, indicating it was a colorectal metastasis from primary small-cell lung cancer.
This case is notable as it is the first reported instance of colon metastasis from small cell carcinoma identified through endoscopic treatment.