Pelvic MRI T2 SMS number with clear borders may be a condition such as a benign teratoma. T2 is the transverse relaxation time, which is the time at which the transverse magnetization intensity disappears.T2 SMS number means that the image is low signal on T2 relaxation, which is usually bone tissue, calcification or fibrous tissue. Clear borders generally means that the tissue boundaries are clear and have not invaded the surrounding tissues or fat layer, which is usually the manifestation of benign tumors. Combined with the description of the problem, if it is a female patient with a T2 signal in the pelvis, it may be a teratoma manifestation, because teratomas often contain teeth, bones and other tissues. Combined with the clear border, it should be a benign teratoma may be large. However, magnetic resonance diagnosis can not only rely on the T2 signal, but also need to refer to the T1 signal and other parameters in order to make a more accurate diagnosis, if necessary, need to be combined with enhanced scanning. It is recommended to consult the attending physician and follow the doctor’s instructions.