I'm sorry you're going through this. It's always nerve-wracking to get unexpected test results.
Mucus in the transverse colon is a normal finding. Too much mucus in that area would be abnormal and would warrant further testing, which is why you're having a CT scan today. However, this does not automatically mean you have cancer. Colon cancer normally arises out of polyps, which can be seen during the colonoscopy.
Several non-cancerous conditions can cause excessive mucus in the transverse colon. Your doctor will use the CT scan results to try to pinpoint what is causing this and whether or not it needs to be treated.
Important: The opinions expressed in WebMD User-generated content areas like communities, reviews, ratings, blogs, or WebMD Answers are solely those of the User, who may or may not have medical or scientific training. These opinions do not represent the opinions of WebMD. User-generated content areas are not reviewed by a WebMD physician or any member of the WebMD editorial staff for accuracy, balance, objectivity, or any other reason except for compliance with our Terms and Conditions. Some of these opinions may contain information about treatments or uses of drug products that have not been approved by the U.S. Food and Drug Administration. WebMD does not endorse any specific product, service, or treatment. Do not consider WebMD User-generated content as medical advice. Never delay or disregard seeking professional medical advice from your doctor or other qualified healthcare provider because of something you have read on WebMD. You should always speak with your doctor before you start, stop, or change any prescribed part of your care plan or treatment. WebMD understands that reading individual, real-life experiences can be a helpful resource, but it is never a substitute for professional medical advice, diagnosis, or treatment from a qualified health care provider. If you think you may have a medical emergency, call your doctor or dial 911 immediately.