GCCs are diagnosed by pathology. They have a characteristic biphasic appearance which includes (1) goblet cell-like cells, and (2) neuroendocrine-type nuclear chromatin (stippled chromatin).
Prognosis
GCCs have an aggressive course compared to other appendiceal neuroendocrine tumours.[1]
^ abvan Eeden S, Offerhaus GJ, Hart AA, et al. (December 2007). "Goblet cell carcinoid of the appendix: a specific type of carcinoma". Histopathology. 51 (6): 763–73. doi:10.1111/j.1365-2559.2007.02883.x. PMID18042066.