Primary appendicealtumors: clinical imaging and pathological findings. Report of four cases.

Primary appendiceal tumors are rare clinical and radiological entities. We report 4cases including muscinous cystadenoma associated with pseudomyxoma peritonei, muscinous cystadenoma associated with mucocele, low-grade muscinous neoplasia associated with appendicitis in elderly patients, and carcinoid tumor associated with appendicitis in a young adult.