by 89 WLS web staff
Doctors are baffled by the case of a 20-year old woman in Maryland, who hasn't aged or grown since she was just a toddler.

Related Story: Incredible Medical Mysteries: Rare Cases that defy explanation

On Thursday's "Katie" with Katie Couric, Brooke Greenberg's family talked about the challenges of raising a child who has not matured in more than 15 years.

Dr. Eric Schadt of Mt. Sinai Medical Center in New York says research is being done to try and figure out this medical mystery.

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