Published online Jan 21, 2022. doi: 10.12998/wjcc.v10.i3.1122
Peer-review started: July 14, 2021
First decision: October 22, 2021
Revised: October 26, 2021
Accepted: December 25, 2021
Article in press: December 25, 2021
Published online: January 21, 2022
Processing time: 184 Days and 23.3 Hours
Distant metastasis of colorectal cancer to the anus is very rare, with only 30 related cases published in PubMed thus far. Therefore, recurrence of colorectal cancer derived anus metastases is rarely seen and less presented.
Here we report an 80-year-old male patient who underwent radical resection for sigmoid colon cancer in January 2010 and another surgery for anal fistula resection in December 2010. Postoperative pathology of the anal fistula revealed a metastatic moderately differentiated adenocarcinoma. The patient subsequently received chemotherapy and radiotherapy. In May 2020, after the patient reported symptoms of anal swelling and pain, computed tomography and magnetic resonance imaging revealed a perianal abscess. Perianal mass biopsy was performed, and the postoperative pathological diagnosis was metastatic moderately differentiated adenocarcinoma.
This case highlights that there is a risk of recurrence of anal metastasis of colorectal cancer even after 10 years of follow-up. We also reviewed the literature and discuss potential mechanisms for anal metastasis of colorectal cancer, thus providing some suggestions for treatment of these cases.
Core Tip: Metastasis of colorectal cancer to the anus is very rare. We describe a patient who had a local anal metastatic recurrence after chemotherapy and local anal radiotherapy. This case highlights that there is a risk of recurrence of anal metastasis of colorectal cancer even after 10 years of follow-up.