An analysis of a literature survey of 104 adenomas of the ampulla of Vater, 94 of the duodenum and 20 of the jejunum and ileum, as well as 735 carcinomas of Vater's ampulla, 180 carcinomas of the duodenum and 72 carcinomas of the jejunum and ileum, demonstrated, in spite of small case collectives, that there is probably a similar close relationship between adenomas and carcinomas in the small intestine, as in the large intestine. In adenomas of the small intestine signs of malignancy sometimes can be seen, as well as in some case of carcinoma of the small intestine rests of adenomas have been described. The age and sex distribution of the epithelial neoplasms of the small intestine permits an adenoma-carcinoma-sequence. The relative distribution of the adenomas over the different parts of the small intestine corresponds with that of the carcinomas. The adenomas and carcinomas of the small intestine in patients with adenomatosis coli have the same relationship to the neoplasms of the small intestine in patients without adenomatosis coli, as it is valid in the large intestine. The hypothesis of an adenoma-carcinoma-sequence in the small bowel with a great significance, which explains the results best, is therefore proposed. As the distribution of adenomas and carcinomas of the small bowel in patients with and without familial polyposis is equal, the theory is suggested, that the principle of the adenomatosis intestine disease is a general increase of the overall liability to adenomas in the large and small intestine.
