Abstract

ICPN is described as a grossly apparent, intraluminal developing mass-forming tumour that is histologically lined by epithelia that exhibit papillary/villous lesions as well as tubular structures with fine fibrovascular stalks and little intervening stroma. In addition, the term "ICPN with stromal invasion" also refers to ICPNs that exhibit microscopically discernible stromal invasion without nodular sclerosing reaction in the wall

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