Pray tell--how do you determine what gender a child's brain is? She may just be a tomboy, as noted already here. Heck--I was when I was her age and my parents didn't rename me Steve.
As a previous poster mentioned, male and female brains are different when viewed under various imaging systems such as MRI's. If a doctor knowledgeable in this area looked at this girl's brain, without knowing all this background, and concluded that it was the brain of a boy, I think that raises some questions.
The easiest way is by doing a CAT scan of the BTSc section of the hypothalamus - it's 62% larger in hetero males than in hetero females. In cases of true transsexuality, they have (for instance) male parts, but a small (female) BTSc, or have female parts, but an enlarged (male) BTSc. That was the point of my earlier post - it's a medically verifiable condition.
That's an easy one. They did a brain scan and it looked like this.
