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Background & Objectives: Carcinoid tumor is the most common appendix tumor and its origin in from neuroendocrine cells. 80% of tumors are located in GI tract and the most common site of the tumor is appendix .This neoplasm is found in 0.3-0.5 percent of appendectomized samples. The mean age in diagnosis time is 30 years old and the neoplasm is more common in women. The aim of this study was to investigate the age and sex prevalence of carcinoid tumor in appendectomized patients.
Methods: This descriptive study was done on 5644 specimens in the Fatemi Hospital of Ardabil  for surveying of carcinoid tumor prevalence, on the basis of age & sex, from 2003-2007.
Results: In this study, the prevalence of carcinoid tumor was 0.19%, average involvement mean 33.6 years old (ST= 23.1) & the men diameter of tumor was 0.74 cm (ST= 0.37). The prevalence in women was 3 in 1000 and in men was 1.36 in 1000.All of the tumor located in the tail portion of appendix. The tumor can cause acute appendicitis by duct obstruction but mostly is discovered during pathologic examination accidentally, conclusion pathologic examination of appendix with sagital incision in all appendectomy cases is recommended.