Appendiceal duplications are among the rare congenital anomalies of the gastrointestinal tract. Laparotomy was applied to a nineteen-year-old male patient due to an injury caused by a piercing-cutting tool, during operation exploration, omental adhesions were present on the appendix and appendectomy was performed to the patient. The histopathological examination of the specimen showed that there was luminal duplication all over the appendiceal wall at the distal 4 cm. portion of the appendix. Appendiceal duplication should definitely be kept in mind in patients with a history of appendectomy and clinical complaints compatible of appendicitis.