1. The localities preferred by the carcinomatous ulcera were in the antrum ventriculi and in the pre-pyloric region.

2. No carcinomatous tissue was found in 5 cases of adenocarcinoma, this being probably due to abrasio before treatment.

3. Autopsy revealed a poorly differentiated urothelial carcinoma of the right renal pelvis, with extensive carcinomatous angiomatosis and metastases to the left kidney, lungs, and regional and mediastinal lymph nodes.

4. The analysis of a literature review of 95 adenomas of the duodenum (without Vater’s Ampulla) demonstrated in 30.2% signs of carcinomatous degeneration; thereby the risk of malign degeneration was dependent from the size of the adenomas and the histological differentiation in villous adenomas, just as in adenomas of the large bowel.