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Brooke Greenberg, a girl who doesn't grow, is a 20 year old trapped in a 4 year old body who suffers from a mysterious medical disorder.

Her extremely rare condition, dubbed "Syndrome X," has puzzled medical professionals for years. Even some of the world's leading experts have been unable to find a medical precedent for her stunted development. The girl weighs 16 pounds and is 30 inches tall.

However, one doctor believes that studying Brooke's biology could offer clues to other mysteries of the human body.

"Many of the best-known names in medicine, in their experience ... had not seen anyone who matched up to Brooke," pediatrician Lawrence Pakula of Johns Hopkins School of Medicine in Baltimore told ABC News. "She is always a surprise."

"From age one to four, Brooke changed. She got a little bit bigger," explained her father, Howard, during the family's appearance on Thursday's "Katie" with Katie Couric. "But age four, four to five, she stopped."

he wears diapers, is pushed in a stroller, gets fed through a feeding tube due to a too-small esophagus, and communicates like an infant would, estimates her mother Melanie.

"Like 6 months," she explained on the show. "If she's happy, she'll giggle and laugh."

Brooke Greenberg has "no apparent abnormalities in her endocrine system, no gross chromosomal abnormalities, or any of the other disruptions known to occur in humans that can cause developmental issues," said Dr. Eric Schadt, director of the Icahn Institute for Genomics and Multiscale Biology at Mount Sinai Medical Center in New York, reports the Daily Mail.