UFC 248 featured Joanna Jedrzejczyk and Zhang Weili in the comain event, an unforgettable and controversial fight that Weili won by split decision to improve her record to 211. Jędrzejczyk suffered a shocking head injury, including a massive, disfiguring hematoma that spread across her forehead and face. Learn from a brain surgeon about how and why this hematoma formed, and her incredible recovery without serious brain injury.