An 18-year-old man was treated for a suspected fractured skull after a fall at the Lake Wallace campground on Saturday night.
An ambulance was called at about 9.30pm after reports the man had fallen from a ute. He was taken by road ambulance to the Blue Mountains, where he was met at the hospital by a helicopter rescue medical team.
He was taken by road to Westmead Hospital for further treatment in a serious but stable condition.
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