4 doctors weighed in:

Borderline inferior cerebellar ectopia present, the cerebellar tonsils demonstrate mild inferior herniation, measuring 4 mm sagittal sequence, means?

4 doctors weighed in
Dr. Michael Gabor
Diagnostic Radiology
3 doctors agree

In brief: It most likely

doesn't mean anything.
If that is the only finding, and the tonsils are otherwise normally shaped, some use less than 5mm as the normal range, so by that criteria 4mm would be normal. Others call 3-5mm benign tonsillar ectopia, an incidental asymptomatic finding. Most consider greater than 5mm to be abnormal(Chiari 1 malformation). The measurement is from the skull base to the tonsil tip.

In brief: It most likely

doesn't mean anything.
If that is the only finding, and the tonsils are otherwise normally shaped, some use less than 5mm as the normal range, so by that criteria 4mm would be normal. Others call 3-5mm benign tonsillar ectopia, an incidental asymptomatic finding. Most consider greater than 5mm to be abnormal(Chiari 1 malformation). The measurement is from the skull base to the tonsil tip.
Dr. Michael Gabor
Dr. Michael Gabor
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