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LOS ANGELES (AP) _ In a risky procedure that took 22 hours, surgeons separated 1-year-old Guatemalan twins joined at the head, a doctor said Tuesday. One of the girls was returned to surgery later Tuesday.

The girl, Maria Teresa, developed a hematoma related to surgery and was brought back into the operating room at 9:17 a.m., doctors announced.

``Despite the complication involving Maria Teresa, we feel that the outlook for both twins is positive,'' said Dr. Jorge Lazareff, lead neurosurgeon.

Lazareff said the hematoma was a collection of blood on the surface of the girl's brain that increases pressure on the organ. Doctors said they were removing the buildup to speed recovery.