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Hello and thank you for your question.
Based on MRI it is suggestive that she has Chiari Malformation.
She needs to be evaluated by a pediatric neurologist.
Medications like diamox can help with her headaches.
Chiari malformation includes a complex group of disorders characterized by herniation of the cerebellum through the large opening in the base of the skull (foramen magnum) into the spinal canal. Which in your daughter's case shows lowering of her brain into medulla.
This is called brain herniation.
The main symptom would be severe headaches more felt when coughing, sneezing.
She most likely has typeII Chiari Malformation.
She she just have headaches as a symptom pain medications like Indomethacin can be prescribed to ease the headaches.
Regular follow up visits with pediatric neurologist is very important.
no it is not a serious condition.
But if symptoms increases your neurologist would provide a symptomatic care.
Sometimes surgery may also be required.
If you have no further questions than please rate my answer positively.