- My CT scan detected a serious obstruction in my sigmoid colon. When I had my operation on Monday they did find obstructions higher up, but the main 'tumour' turned out to be the mesh inserted after a hernia op a few years ago. So no need for a stoma, and a much quicker recovery time than had been expected. My surgeon saiid he always treats the patient not the scan. Of course that means they might find problems…