We report a case of benign appendicular mucucocele in a 51-year-old patient. The clinic was that of a painful mass of the right iliac fossa evoking the diagnosis of an appendicular plastron. . An appendectomy with uncomplicated stump burial was performed 14 months after the procedure. Histopathological examination of the operating room found a mucinous cystadenoma of the appendix. The occurrence of chronic abdominal pain localized in the right iliac fossa, associated with palpation of a mass in the right iliac fossa should suggest the possibility of an appendicular mucocele.