Fistula Formation Secondary to Mucinous Appendiceal Adenocarcinoma May Be Related to a Favorable Prognosis: A Case Report and Literature Review

A 90-year-old man was referred to our hospital because of a positive fecal occult blood test. Colonoscopy revealed a lesion with multiple nodules covered with abundant mucus at the hepatic flexure. Computed tomography showed a dilated appendix attached distally to the hepatic flexure. Right hemicolectomy was performed, and the pathological examination revealed a mucinous appendiceal adenocarcinoma infiltrating the hepatic flexure without...