Hydatid cyst refers to a benign congenital disorder that occurs in the neck of the fetus, the incidence is not high, so not many fetuses have hydatid cyst. Hydrocysticercosis is a congenital malformation of the lymphatic tissue, which usually appears in the neck of the fetus, and manifests itself as a smooth and soft swelling after birth, with a relatively obvious sense of fluctuation and no tenderness. The fluid inside the hydatid cystic tumor is lymphatic fluid. Although hydatid cystic tumor is a benign lesion, it can have adverse effects on the surrounding tissues if not treated actively. The incidence of hydrocysticercosis is not very high, and the treatment usually involves injecting medication into the wall of the cyst to make it degenerate on its own. If a pregnant woman discovers a hydatid cystic tumor in her fetus during an obstetrical examination, it is recommended that she seek medical attention in a timely manner, and under the guidance of a doctor, observation and treatment will be carried out to promote the life and health of the fetus.