"lack of a separating inter-twin membrane"
Expected headings
"Embryology"
"Ventral union"
"Dorsal union"
"Lateral union"
"Associations"
"Radiographic assessment"
"Ultrasound"
"The prevalence of conjoined twins ranges from 1:50,000 to 1:200,000. They are more common in parts of Southeast Asia and Africa with prevalence rates as high as 1:14,000 to 1:25,000. There is a recognised female predisposition (F: M of approximately 3:1)."
"There is a higher incidence of congenital malformations in conjoined twins (10-20%) which are unrelated to the point of fusion such include"