High-grade tubular adenomas of the ascending colon have a high likelihood of being precancerous and require regular follow-up or early surgical treatment. During colonoscopy, a biopsy of the pathologic tissue will be performed in the area where the lesion is considered to be, and the next treatment plan will be decided after the results of the pathology are reported. If it is a high-grade tubular adenoma of the ascending colon, it may be a precancerous lesion and should be resected as soon as possible, depending on the size of the lesion and the degree of invasion to decide whether endoscopic resection or surgical resection is necessary. If the pathologic result is the tissue after surgical resection, then the patient must be informed of the possibility of recurrence by regular follow-up colonoscopy every 3-6 months, and the follow-up treatment should be decided according to the result of the follow-up examination. Although tubular adenoma of the ascending colon has the possibility of precancerous lesions at a high level, it is not necessarily cancerous and may remain a benign tumor result. Therefore, it is necessary to actively cooperate with the doctor for treatment.