Mullerian carcinosarcoma in the colon of a patient with history of endometrial carcinoma: A case report and insight into possible pathogenesis

- Mullerian carcinosarcoma can occur in extragenital sites.
- Malignant transformation of endometriosis is common in the rectosigmoid area.
- MLH1 hypermethylation has been implicated in endometriosis-associated carcinomas.
- Adequate sampling is essential in determining the etiology of colonic tumors.