Final answer:
A Billroth I procedure is a type of surgery where the remaining part of the stomach is connected directly to the duodenum, while a Billroth II involves connecting the remaining stomach to the jejunum, bypassing the duodenum.
Step-by-step explanation:
The difference between a Billroth I and a Billroth II procedure relates to the type of gastrectomy (partial removal of the stomach) and the method of anastomosis (reconnecting the digestive tract) performed during surgeries for peptic ulcer disease or stomach cancer. In a Billroth I surgery, also known as a gastroduodenostomy, the bottom part of the stomach (antrum) is removed and the remaining part of the stomach is directly connected to the duodenum. On the other hand, during a Billroth II procedure, which is also referred to as a gastrojejunostomy, a more extensive portion of the stomach is removed and the remaining portion is connected to the jejunum, bypassing the duodenum entirely.