[A Case of Ascending Colon Cancer with Duodenal Fistula Treated by Gastrojejunostomy Combined with"Separation Surgery of the Right-Sided Colon"].

An 80-year-old man presented with fever and vomiting. Abdominal CT and upper and lower gastrointestinal endoscopy revealed ascending colon cancer with duodenal invasion, resulting in the formation of a duodenocolic fistula. The patient's general condition was poor, with an Eastern Cooperative Oncology Group-performance status(ECOG-PS)of 3, rendering the patient unsuitable for radical resection and chemotherapy. However, the patient strongly desired to resume oral intake and was discharged from the hospital. As a palliative measure, gastrojejunostomy and"separation surgery of the right-sided colon"were performed. No severe post-operative complications were observed. The patient was able to resume oral intake in combination with enteral nutrition via a feeding tube and was discharged 1 month after surgery. Gastrojejunostomy combined with"separation surgery of the right-sided colon"is considered a safe and effective palliative surgical option for managing duodenocolic fistula, providing symptom relief and improving the quality of life.