Small clusters and cords, no poorly differentiated or undifferentiated carcinoma
Irregular large clusters, no poorly differentiated or undifferentiated carcinoma
May have confluent sheets of cells OR >1 low power field or >1 mm2 of conventional type adenocarcinoma, usually poorly differentiated or undifferentiated
Based on histopathologic findings in primary tumor
All must have at least focal typical goblet cell carcinoid
Based on Tang 2008