Concussions: Are there different grades of concussions?
Dr. Michael Rosenthal describes the different levels of severity of a concussion.
Zhen Chao, now called Maddox, was born in China with a genetic condition called neurofibromatosis type 1 (NF1) that can cause painful or disfiguring tumors called plexiform neurofibromas. Read about Maddox.
Read More of Maddox's Story
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