Neoplasms of the appendix
There are a number of neoplasms that can involve the appendix, some of which are peculiar to this site.
Tumors involving the appendix have been found in only about 1% of all appendectomy 9. Epithelial neoplasms and neuroendocrine tumors represent the gross majority of the tumors affecting the cecal appendix.
Symptoms may vary from patients being completely asymptomatic, such as in small benign neuroendocrine tumors, to a clinical picture of acute appendicitis, which is reported in ~40% of cases and most commonly seen associated with neuroendocrine tumors 9.
Carcinoid syndrome related to malignant neuroendocrine tumors is rare, present in less than 5% of patients with this tumor.