Two cases of combined goblet cell carcinoid and mucinous cystadenoma o
ccurring in the appendix are reported. The histogenesis of the goblet
cell carcinoid remains one of its most controversial aspects and the o
ccurrence of both of these relatively uncommon tumours in the same org
an may lend support to the unitary stem cell hypothesis on the origin
of this tumour. Alternatively, this occurrence may represent an exampl
e of the adenoma/carcinoma sequence.