While riding to class on one of the school's rental bikes, a handlebar grip came off during a turn and my son crashed. He hit his head pretty hard and he saw spots in front of his eyes. They've since cleared up.
His head is bleeding, his left shoulder hurts, and his right thumb too.
The doctor first said he had "at worst a mild concussion." But they did an X-ray and saw "a faint line" in his neck that apparently warrants a closer inspection. Now they're doing a CT scan.
My fingers are crossed that it comes back negative.