Jupitter News _ Abigail "Abby" Loraine Hensel and Brittany "Britty" Lee Hensel (born 7 March 1990, Carver County, Minnesota, United States), are dicephalic conjoined twins.
They have two spines which join at the pelvis. They have two stomachs, four lungs (two partially conjoined pairs), and two arms. (A third, underdeveloped and unusable arm between their heads was amputated in infancy.
By : http://interesting-amazing-facts.blogspot.com/2009/04/strange-happenings-dicephalic-conjoined.html