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A leading child abuse expert says the Kahui twins had suffered the worst brain injuries he has seen in 15 years.
Specialist paediatrician Dr Patrick Kelly has told the jury that he had never before seen non-accidental head injuries of the type the twins had.
Kelly is giving evidence at the Chris Kahui's double murder trial, following the deaths of his three-months-old twins Chris and Cru in June 2006.
He said the head injuries they suffered would have been the result of rapid deceleration, meaning the brain was still moving inside the head, once the skull had stopped.
Kelly told the court along with brain bleeds, both babies had brain tears which he has not seen in an infant in 15 years.
"I have never seen the back of a skull collapse in as dramatically as inwards as it had in Chris," Kelly says. "I would describe them as very severe, right at the top of the scale."
The Crown says Chris Kahui injured the twins on June 12 while alone in their nursery.
The twins later died 14 hours apart at Starship Hospital from severe brain damage.
Kelly says there are plenty of surfaces in the bedroom that the boys could have been smacked against.
"The rails of the cot, the floor, or even the door of the nursery where they slept," he says.
Chris Kahui denies murdering them.
The defence says cellphone records prove that the twins' mother, Mascyna King had time to return home and hurt her babies.
The trial is set to continue.