Has anyone had this show up on an MRI? I had an MRI to test for pituitary gland abnormality and while the pituitary was fine the internist picked out Cerebellar Tonsil Herniation. The radiologist either missed it or felt it was not significant as the MRI was ordered for pituitary (go figure). In layman's terms, my brain is too big for my skull. In other words, upright-health.com states: Tonsillar ectopia, also known as cerebellar tonsillar ectopia, Chiari malformation and Arnold-Chiari malformation, is associated with descent of the bottom portion of the cerebellum into the foramen magnum. In this regard, ectopia means an abnormal location or position of an organ or body part. Hence CTE refers to a downward displacement of the lower portion of the cerebellum, called the tonsils into the foramen magnum. The foramen magnum is the large hole in the base of the skull for the passage of the brainstem and cord. Of interest is that the The National Fibromyalgia Research Association (NFRA) states: *Chiari I is the type of malformation being discovered in people diagnosed with fibromyalgia and CFIDS (Chronic Fatigue and Immune Dysfunction Syndrom) It took me a bit off guard and I initially went along with the "wait and watch idea" given by the internist in his 5-10 minute perusal of my brain. After I started reading about it, think I am going to ask for second opinion. In a projection of frustration to doctors I really do not get it. I have an integrative internist order an MRI and abdominal CT Scan based on blood work that a an endocrinologist would not do (same exact symptoms presented) and a previous internist would not even consider. The integrative internist orders the MRI and CT Scan but the radiologist misses/does not note the Cerebellar Tonsil Herniation (it is not hard to see when pointed out - about 75% of my foramen magnum into the spinal canal is blocked by the herniation - like a clogged pipe). The integrative internist, upon seeing the Cerebellar Tonsil Herniation, tells me something is wrong very quickly, but then vacillates a bit and says lets wait and see if I get headaches. Forget the cognitive, memory, visual, sleep, sleep apnea problems I have complained about for the last 3-8 months - let's wait and see. In the space of a 20-30 minute visit I gave way to suggestibility and took the headaches to be the defining aspect, but then a quick Google tells me about the cognitive, memory, visual, sleep, sleep apnea problems associated with it. So, then what, I am running out of doctors but give a call to a pdoc who is evaluating me for TMS (Transcranial Magnetic Stimulation) and leave message to ask him to look at the MRI. Now waiting on that. I am thinking maybe a neurologist/neurosurgeon should have a look at the MRI, but you can not get to them (at least the ones I have queried) without a referral. As much as I like some of my doctors I think it might get to the point where I have to start to bring up the idea of malpractice to get anything done (e.g. "I would sure hate to be wrong about that.") - I don't know, is that what it requires? I had previously asked this integrative internist for a neurologist referral to look for MS based on symptoms, but he said the MRI would be able to show signs of that, which was thankfully absent according to him. Just to rattle on a bit, it was another pdoc that had ordered a slew of blood tests and told me my liver was fine, only to find out today, after more tests and the abdominal CT Scan it was a fatty liver. ARG!!! Here are some more links to Cerebellar Tonsil Herniation/Chiari Malformations/Tonsillar Ectopia if anyone has an interest or may want a doc to revisit/request an MRI: Brain Herniation Imaging Chiari I malformation If anyone else has seen this/had treatment for it, please post.