Choroidal tubular adenoma of the transverse colon with no definite lesion at the base means that the tumor is a benign lesion without malignancy. Transverse colon choriocapillaris tubular adenoma is a type of colon polyp, which can be cancerous, and the cancerous process usually starts with atypical lesions and then further develops into cancerous phenomenon. This kind of disease can present with symptoms such as diarrhea, abdominal pain, and mucus, pus, and blood stools, which can be detected by colonoscopy. It can be detected by colonoscopy and treated by endoscopic resection. After resection, the disease is usually sent to the pathology department for biopsy, and if there is no clear lesion at the base of the biopsy, it means it is a benign lesion, and after surgical resection, it can be treated by taking a light diet and regular rechecking.