<prompt> Most common neoplasm of appendix isPseudomyxoma peritoneiAdenocarcinomaCarcinoidLymphoma  <response>: 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 