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Table 1 Microproliferation of argyrophil cells [2]

From: The term "carcinoid" is a misnomer: the evidence based on local invasion

I

 

Hyperplastic: Intraglandular

II

 

Preneoplastic: Intraglandular

III

 

Neoplastic

 

IIIa

Intraglandular

 

IIIb

Extraglandular ("budding": microinvasion)

  1. Extraglandular neoplastic formation starts with a form of "budding" (IIIB).