Most common neoplasm of appendix is
Carcinoid tumours arise in argentaffin tissue (Kulchitsky cells of the crypts of Lieberkuhn) and are most common in the vermiform appendix.The tumour can occur in any pa of the appendix, but it is frequently found in the distal third.Ref: Bailey & Love&;s Sho Practice of Surgery
Pseudomyxoma peritonei
Adenocarcinoma
Carcinoid
Lymphoma
G.I.T