[Mucinous cystadenoma of ileocecal appendix].

We present two patients with mucinous cystadenoma and mucinous cystadenocarcinoma of the appendix, respectively. These are very uncommon lesions in that localization. We point out the lack of specificity of the term "mucocele" and also the need of strict criteria to define this type of lesions in order to establish the adequate treatment. Usually the diagnosis is not possible before surgery. The treatment consists of simple appendectomy for the benign lesions and right hemicolectomy for mucinous carcinoma.