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WHO Classification of Tumours
Select tumour for C24.1 - Region of the ampulla of Vater:
The number attached to each tumour is the ICD-O morphology code of the International Classification of Diseases for Oncology (ICD-O) [1] and the Systematized Nomenclature of Medicine (http://snomed.org).
/0 benign tumours
/1 unspecified, borderline or uncertain behaviour
/2 in situ carcinomas
/3 malignant tumours.

1. Fritz A, Percy C, Jack A, Shanmuragatnam K, Sobin LH, Parkin DM, Whelan S (Eds) International Classification of Diseases for Oncology. World Health Organization: Geneva 2000

Premalignant lesions
    8144/0 Intestinal-type adenoma
        8211/0 Tubular adenoma, NOS
        8263/0 Tubulovillous adenoma, NOS
        8261/0 Villous adenoma, NOS
    8163/0 Noninvasive pancreatobiliary papillary neoplasm with low-grade dysplasia (low-grade intraepithelial neoplasia)
    8163/2 Noninvasive pancreatobiliary papillary neoplasm with high-grade dysplasia (high-grade intraepithelial neoplasia)
    8148/2 Flat intraepithelial neoplasia (dyplasia), high grade

    8140/3 Adenocarcinoma, NOS
        8144/3 Adenocarcinoma, intestinal type
        8163/3 Adenocarcinoma pancreatobiliary type
    8560/3 Adenosquamous carcinoma
    8310/3 Clear cell adenocarcinoma, NOS
    8576/3 Hepatoid carcinoma
    8260/3 Papillary adenocarcinoma, NOS
    8480/3 Mucinous adenocarcinoma
    8490/3 Signet ring cell carcinoma
    8070/3 Squamous cell carcinoma, NOS
    8020/3 Undifferentiated carcinoma
    8035/3 Undifferentiated carcinoma with osteoclast-like cells

Neuroendocrine neoplasms
    8240/3 Neuroendocrine tumor G1 (NET G1) / Carcinoid
    8249/3 Neuroendocrine tumor G2 (NET G2)
    8246/3 Neuroendocrine carcinoma, NOS
        8013/3 Large cell neuroendocrine carcinoma
        8041/3 Small cell neuroendocrine carcinoma
    8244/3 Mixed adenoneuroendocrine carcinoma
    8241/3 Enterochromaffin cell (EC), serotonin-producing neuroendocrine tumour (NET)
    8683/0 Gangliocytic paraganglioma
    8156/3 Somatostatinoma, malignant