The clear boundary and irregular shape of the lump without blood flow signal indicate that the growth of the lump may be slow, and the possibility of benign is relatively high, you can carry out pathological biopsy to clarify the symptoms of the tumor, and carry out treatment under the guidance of the doctor. The clear boundary of the lump is irregular in shape and no blood flow signal indicates that there is no blood vessel supplying nutrients in the nodule. If the patient himself suffers from a tumor, the possibility of benign is generally higher, and a small amount of blood vessels may appear around the periphery of the tumor; if it is a malignant tumor, the periphery and the interior of the periphery may be seen under ultrasound with abundant blood flow signals, and the specifics have to be combined with other aspects of the information to determine the synthesis. If there is any discomfort, consult a doctor in time, and it is recommended to carry out pathological biopsy to make a clear diagnosis, and standardize the treatment under the doctor’s guidance, so as to avoid delaying the condition.