Who can tell you what essentially normal means for a brain scan?

Am looking for Arnold Chiari 1 malformation, but the doctor said there is no sign of cysts....was not what l wanted them to look for?

My 9 year old granddaughter has been disgnosed with AC1M, and we have alot of family members with brian problems, like cysts and hydrocephalus etc. And now the 9 year old has got a hydromyelia on her spine.

Just need some answers to see where this all came from...l certainly have a lot of sypmtoms for years, without knowing about the condition.

Can anyone answer my question, l wuld be most grateful.

Thanks so much from Chriskeykey