The separation of the two had started in 2014.

A multi-disciplinary team of doctors successfully separated Syrian conjoined twins after a marathon 14-hour operation here on Sunday.

The team, led by Ahmed Al-Ferayan, a consultant neurosurgeon, completed the procedure four hours ahead of the scheduled time planned. There had been a 60 percent chance of success because the children’s head and brains had to be separated.

The two baby girls, Tuqa and Yakeen, had arrived at King Abdullah Specialist Children’s Hospital in Riyadh on Sunday. The surgery started at 7:30 a.m., with the microscopic separation of the brains beginning at 1:30 p.m.

The twins underwent a series of medical tests following their arrival at the hospital, to check the extent of the connection between their brains, particularly the arteries.

The separation of the two children had started on June 9, 2014, when their arteries were first separated in their brains with a slice of silicon inserted. This procedure was successful with no complications.

Three months later, the second stage was performed in which the remainder of the veins was separated along with a portion of the arteries that carried blood from Tuqa to Yakeen. This procedure was also successful.

The third stage was one of the most complicated because it involved almost complete separation, with silicon inserted. This was also successful.

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