The appendix is the most frequent site of carcinoids, i.e. tumours with endocrine differentiation, that span a wide range of morphological variety.
Adenocarcinomas of the appendix also show interesting morphological variations, from those that resemble the usual colorectal carcinoma to those that arise from a carcinoid and to mucinous tumours that may appear well differentiated and indistinguishable from adenoma and yet spread widely through the peritoneal cavity.
WHO histological classification of tumours of the appendix1
Was this article helpful?