U.S. doctors online nowAsk doctors free
Magna, UT
A 33-year-old female asked:

What does it mean when my mri results say that my cerebellar tonsils are seen low lying 4.2mm below, suggesting chiari malformation?

2 doctor answers4 doctors weighed in
Dr. Reza Karimi
Neurosurgery 16 years experience
Chiari malformation: What you're describing is a typical finding for a chiari type 1 malformation. Chiari malformation is basically when part of the brain (cerebellum) sits below the base of the skull. This may cause headaches, weakness, trouble swallowing/speaking, numbness of the arms....Many different symptoms are possible. It also can be asymptomatic. Get a neurological or neurosurgical evaluation.
Dr. Edison McDaniels
Specializes in Neurosurgery
Inconsequential: Why did you get an MRI? Having symptoms? Normal tonsils can descend up to 5-6 mm. In most cases, it is more the appearance crowding at foramen magnum (opening at the base of the skull; the tonsils in ur case pass 4.2 mm below this) than the actual #. Error in this measurement as well, so to say 4.2 mm is a bit disingenuous as the measurement is not that accurate. This is a very common situation.

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Educational text
Free
Talk to a doctor
24/7 visits - just $39!
50% off with $15/month membership

Similar questions

Baton Rouge, LA
A 24-year-old female asked:

Does "some what low lying cerebellar tonsils" necessarily mean chiari malformation? That was the impression on my mri. Should I be worried?

1 doctor answer2 doctors weighed in
Dr. Walter Husar
Neurology 33 years experience
Not really: Unless the cerebral tonsils are below the foramen magnum and you have clinical signs of hydrocephalus or enlargement of the ventricles in your brain, you don't have any worries.

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Educational text
Free
Talk to a doctor
24/7 visits - just $39!
50% off with $15/month membership
Last updated Aug 19, 2017

Disclaimer:

Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.