Sienna and Sierra Bernal of Tomball are identical twins, but no one would ever guess it: Sierra looks like most other 11-year-olds, while Sienna is a primordial dwarf.
She's three-feet-ten and 27 pounds. She is maybe one of 200 people in the world classified as primordial dwarves.
As Craig Malisow writes in this week's feature story:
Sienna eventually became part of ongoing studies at Texas Scottish Rite Hospital in Dallas and the Nemours/Alfred I. duPont Hospital for Children in Delaware. Along with about 40 other primordial dwarfs in the U.S., Sienna has contributed her DNA and medical history to help doctors understand the genetics behind this rare form of dwarfism, as well as how this dwarfism relates to other medical conditions. But when Sienna's not helping solve an incredible genetic mystery, she's simply trying to be a regular 11-year-old girl
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