Fallopian tube paramesonephric duct cyst

For women, the fallopian tube is an extremely important part, but at the same time, this part is also prone to diseases, such as fallopian tube paramesonephric duct cyst. If this disease is detected during the examination, people will definitely feel very panic. There is no need to worry too much. You can first have a more detailed understanding of this disease so that you can have a better understanding. The following will give people a detailed introduction to fallopian tube paramesonephric duct cyst.

Chinese name

Paramesonephric duct

Foreign name

Deputy in the renal tubular

Appearance time

Embryo Week 5

Evolution

Evolved into the vaginal opening

From the fifth week of embryogenesis, the coelomic epithelium on both sides of the mesentery on the back of the embryonic coelomic cavity proliferates, hypertrophies, and bulges to form the urogenital ridge, with the mesonephros on the outside and the genital ridge on the inside, which is the origin of gonadal development. Both men and women have the mesonephric duct and the paramesonephric duct outside the genital ridge. When the gonads differentiate, the two pairs of ducts evolve differently. In females, the mesonephric ducts degenerate into relics, while the paramesonephric ducts develop into female internal reproductive organs. The process is as follows: During the 6th week of embryonic development, the coelomic epithelium on the outer side of the head end of the mesonephric duct sinks into the interstitium to form a longitudinal groove, which develops toward the tail side of the embryo. Soon the edges of the groove unite to form a tube called the paramesonephric duct, one on each side. The head section of the tube communicates with the abdominal cavity, forming the fallopian tube. The middle section of the paramesonephric duct slants inward and downward, evolving into the fundus and body of the uterus. The two sides of the paramesonephric duct merge to form the cervix and upper vagina. At the 12th week of the fetus, the uterine wall thickens to form the vaginal vault. At the 16th week of the fetus, the uterine muscle layer is formed. At the end of the 24th week, the uterine cavity epithelium and glandular buds begin to appear, and by the endometrial glands are complete at full term. During fetal development, the uterus develops rapidly under the influence of placental hormones, and the length ratio of the uterine body to the cervix is ​​1:2 at birth. The tail end of the paramesonephric duct forms the upper part of the vagina, and the tail end is connected to the urogenital sinus, forming the paramesonephric nodule at 12 weeks of fetal development. The two are connected to form the lower part of the vagina. The epithelium of the urogenital sinus proliferates to form a ring-shaped thin film which is the external opening of the vagina, called the hymen.

It originates from the residual paramesonephric duct epithelial tissue, that is, the cystic type of vaginal adenosis. Single or multiple lesions may occur anywhere on the vaginal wall. The cyst wall is columnar epithelium, similar to the endocervical columnar epithelium or fallopian tube epithelium, and is positive for PAS (periodic acid Schiff reaction).