Anastomotic Leakage After Colorectal Surgery.

This study is collecting information about patients who develop an anastomotic leak after colorectal surgery — a serious complication where the connection between two sections of the bowel leaks. Researchers want to better understand what causes this complication and how it can be prevented or treated. **You may be eligible if...** - You are 18 years or older - You are having elective or emergency colorectal (bowel) surgery where the two ends of the bowel will be joined (anastomosis) - You are able to provide written informed consent **You may NOT be eligible if...** - You are having surgery where no bowel connection is made (e.g., you will have a permanent stoma/bag) - You have inflammatory bowel disease (Crohn's disease or ulcerative colitis) - You have had previous colorectal surgery that involved a bowel connection - You are pregnant - You are unable to give informed consent or follow up after surgery Talk to your doctor to see if this trial is right for you.