We reported a case with an obstructive acute abdomen, and emergency exploratory laparotomy was performed. Appendiceal neoplasm was observed adhered to the ileum, and an ileohemicolectomy was performed. From the histopathological point of view the neoplasm was an infiltrating colonic type adenocarcinoma of the appendix, with extension to the periapendicular adipose tissue and fixation of an adjacent ileal loop secondary to infiltration of the intestinal wall. The tumor produced a moderate luminal stenosis of the intestine, this explained the clinical manifestations of the patient. Post-operative evolution was satisfactory and there had been no signs of recurrence in the 5 years since the operation. Based upon the comparison of clinical characteristics, pathological behavior (in relation to the growth and dissemination), and therapeutic considerations, possibly colonic type adenocarcinoma of the appendix is a neoplasm similar to the carcinomas of ascending colon.