Brazilian twins who were joined at the head have been successfully separated with the assistance of virtual reality.
Three-year-olds Bernardo and Arthur Lima underwent surgeries in Rio de Janeiro, with direction from Great Ormond Street Hospital in London.
The teams spent months trialling techniques using virtual reality projections of the twins, based on CT and MRI scans.
The twins had seven surgeries, involving more than 27 hours of operating time in the final operation alone, and almost 100 medical staff.
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