[A Case of Metachronous Anal Metastasis from Rectal Cancer]

A 49-year-old man underwent low anterior resection for rectal cancer with liver and lung metastases. He refused additional systemic chemotherapy. After 10 months, he presented with a painful anal tumor and we performed trans-anal resection of the tumor. Histopathological examination revealed a metastasis of the rectal cancer. Chemotherapy was performed subsequently. He survived 7 months after the second surgery without local recurrence. We reported a rare case of anal metastasis from rectal cancer.