2 doctors weighed in:

What is the difference between mild cerebellar tonsillar ectopia and chiari malformation 1. Are there other treatments beyond surgery?

2 doctors weighed in
Dr. Michael Gabor
Diagnostic Radiology
1 doctor agrees

In brief: Both situations

imply that the cerebellar tonsils protrude beyond the foramen magnum. Mild ectopia generally means that the tonsils do not protrude far enough to meet the distance criteria of Chiari 1, and are normally shaped and without other findings seen in Chiari 1.
The vast majority of "mild ectopias" are normal anatomic variations and cause no symptoms.

In brief: Both situations

imply that the cerebellar tonsils protrude beyond the foramen magnum. Mild ectopia generally means that the tonsils do not protrude far enough to meet the distance criteria of Chiari 1, and are normally shaped and without other findings seen in Chiari 1.
The vast majority of "mild ectopias" are normal anatomic variations and cause no symptoms.
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