The presence of an irregular attenuation zone on the left side of the gestational sac is firstly considered to be accompanied by hemorrhage leading to irregularity of the surface of the gestational sac, and secondly, it is considered that there may be a problem of preeclampsia, which should be further examined and treated by a doctor in a timely manner. The presence of irregular attenuation zone on the left side of the gestational sac is an imaging diagnosis, at this time, it is necessary to consider the possible existence of embryonic arrest or preeclampsia, it is necessary to determine whether it is consistent with the number of days of pregnancy according to the level of chorionic gonadotropin and luteinizing hormone levels in the blood and it is necessary to carry out dynamic observation. If the diameter of the sac is greater than 2.5 centimeters during dynamic observation, it is considered that there may be a cessation of embryonic development, and if the diameter of the sac is less than 2.5 centimeters, it is recommended to repeat the examination after two weeks, as well as to monitor the hormone levels in the blood on a regular basis. If there is an irregular attenuation of the fetal sac, it is recommended to consult the Obstetrics and Gynecology Department of a regular hospital for diagnosis and treatment.