I have had constipation for about a month now. So far I have had a ct scan that detected that there was an enlargement in my small intestine. My GI doctor ordered for me to have a barium x-ray tests done. The test came back negative, but did say that small bowel dilation is identified. my constipation seems to be getting worse and the stool that I do pass is usually thin and small. also its full of lquid. What could be the cause of my constipation?