The sixth ventricle will not disappear in children, and the formation of the sixth ventricle mainly refers to the existence of congenital developmental abnormalities, but does not belong to the disease. From the perspective of clinical medicine, the formation of the fifth and sixth ventricles is caused by congenital developmental abnormalities, which is a manifestation of anatomical variations, and does not belong to diseases, nor will it bring serious damage to the human body. For normal people the ventricles are divided into a system of lateral ventricles, mainly including the third and fourth ventricles. Only in a small number of people, the lobules of the septum pellucidum do not fuse in about two months after birth, so the septum pellucidum still exists in adulthood and is gradually filled with cerebrospinal fluid, and the existence of the fifth and the sixth ventricles may be found in the CT MRI examination. If there is more cerebrospinal fluid in the area, septum lucidum cysts may appear, but these cysts will not press on the surrounding normal brain tissue, so no special treatment is needed. If the patient is worried, he can also go to the hospital for regular brain examination.