Conjoined twins

Conjoined twins refer to a phenomenon where parts of the bodies of twins are connected, which is a very rare congenital malformation. Conjoined twins are extremely rare. The incidence during pregnancy is approximately 1/50,000 to 1/100,000, and the incidence in live births is about 1/200,000. Most studies show that the incidence of female conjoined twins is significantly higher than that of males, with a male-to-female ratio of 1:3. The most common types of conjoined twins are those connected at the chest or abdomen.