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Abigail Loraine Hensel and Brittany Lee Hensel (born 7 March 1990, Minnesota, United States) are dicephalic conjoined twins. Brittany ("Britty") is the left twin, and Abigail ("Abby") is the right twin. They have two spines which join at the pelvis. They have two stomachs, three lungs, and at birth, three arms (the arm between their heads was underdeveloped and useless, and was amputated in infancy).
The boy, named Kiron and weighing 12 lbs 1 oz, was born by Cesarean section on [25 August 2008] at a clinic in Keshobpur, 85 miles from the capital, Dhaka.
Conjoined/Siamese twins are identical twins whose bodies are joined in utero. A rare phenomenon, the occurrence is estimated to range from 1 in 50,000 births to 1 in 200,000 births, with a somewhat higher incidence in Southwest Asia and Africa. Approximately half are stillborn, and a smaller fraction of pairs born alive have abnormalities incompatible with life. The overall survival rate for conjoined twins is approximately 25%. The condition is more frequently found among females, with a ratio of 3:1.
Two contradicting theories exist to explain the origins of conjoined twins. The older and most generally accepted theory is fission, in which the fertilized egg splits partially. The second theory is fusion, in which a fertilized egg completely separates, but stem cells (which search for similar cells) find like-stem cells on the other twin and fuse the twins together.