<prompt> Which is the MOST common neoplasm of appendix?LymphomaAdenocarcinomaLeiomyosarcomaArgentaffinoma  <response>: Sabiston writes: Although it was previously believed that carcinoid tumors were the most common appendiceal neoplasm, analysis of the surveillance, Epidemiology, and End results SEER database indicate that mucinous tumors are most common in appendix. Ref: Sabiston 18e, Page 1345 