Obstructive spinal sacrococcygeal display generally refers to the obstruction of fetal spinal sacrococcygeal display by ultrasound, which may be caused by abnormal spinal development, fetal positional factors, and errors in imaging examination. 1. Abnormal spinal development: If the sacrococcygeal region of the spine is not clear on ultrasound, it may be caused by congenital developmental abnormality of the fetal spine, and further examination such as fetal magnetic resonance imaging is needed to clarify. 2. Fetal position: if the spine of the fetus is blocked by other limbs, the spinal sacrococcygeal region may not be clearly shown in the ultrasound examination. However, with the change of body position, the spine may gradually become clear. 3. Imaging errors: If the probe is placed in an abnormal position during ultrasound imaging, the sacrococcygeal region of the spine may not be clearly visible. If the spine is not clear, you should go to the hospital in time to see a doctor to clarify the cause of the disease and get the right treatment under the doctor’s guidance.