The medical community is still reeling Friday over news that a 9-year-old girl from Greece had a two-inch growth -- believed to be her twin embryo -- removed from her stomach.

"It is a very rare situation to have an embryo inside a twin. I cannot recall anything like that in my practice over the years. I have only heard about it through medical literature,” said Dr. Kathy Anderson, an Obstetrician and Gynecologist located in Costa Mesa, Calif.

FRIDAY, May 2 (HealthDay News) -- Pregnancy is hard work, and it's even harder when you're working while pregnant.