UCLA Medical Center advises that the surgery on the conjoined twins is progressing as planned and is expected to last another 10 hours.
Surgeons have a challenge on their hands. The one-year-old girls from Guatemala are joined at the head and face in opposite directions. That happens in fewer than one in one million live births.
Doctors will try to separate veins that connect the front of each girl's head to the back of the other. The hospital also advises that it plans no further statements until the surgery is finished.
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