A slightly hyperechoic mass in the uterine cavity may be dangerous. Slightly hypoechoic mass in the uterine cavity, we have to find out the reason, this phenomenon occurs during ultrasound, it may be endometrial polyps, endometrial precancerous lesions, endometrial cancer, submucosal uterine fibroids, which may appear hypoechoic. So at this time it is better to do an examination of the uterine cavity, under the observation of hysteroscopy can make a clear diagnosis, as long as it is a benign tumor in the uterine cavity, there is nothing to be afraid of, can be treated under the hysteroscopy. However, if the pathology of the biopsy taken by hysteroscopy is endometrial cancer, it is necessary to do another operation. In this case, total hysterectomy and bilateral adnexectomy are required, and the extent of the surgery is determined by the patient’s specific condition and age. Slightly hyperechoic mass in the uterine cavity should be promptly examined and treated under the supervision of a doctor.