Identical twins who are sometimes physically attached are known as conjoined twins. There are two chances for the creation of conjoined twins- either the single fertilised egg is not divided entirely during the production of identical twins, or two fertilised eggs bounded together during the growth. Conjoined twins emerge when an early embryo only partially departs to form two individuals. Although two fetuses will evolve from this embryo, they will remain bodily connected — mostly at the abdomen, chest or pelvis. They may also share one or more physical organs. Conjoined twins can be diagnosed beforehand in the pregnancy applying standard ultrasound.