Craniopagus twins are conjoined twins who are fused at the cranium.This condition occurs in about 10- 20 babies in every million births. Among this small group, cephalic conjoining, or craniopagus twinning, represents the rarest of congenital abnormalities only accounting for 2-6% of all conjoined twins. Additionally, conjoined twins are genetically identical and always share the same sex. The union in craniopagus twins may occur on any portion of the calvarium, but does not include either the face or the foramen magnum. The union may involve the entire diameter of the head or only a small portion. There are an infinite amount of variations that can occur. Most of these variations are based on the rotation of one twins’ skull to the other. Each of these factors (rotation, spot of union) affect the development of the brain,the vascular system within the brain and overall wellness of life both of the twins have outside the womb.Relatively few craniopagus twins survive the perinatal period- approximately 40% of conjoined twins are stillborn and an additional 33% die within the immediate perinatal period, usually from organ abnormalities and failure. 

Keywords: Conjoined twins; Craniopagus type; Medical and social issues.