Chiari Bridges

Tag: multiple sclerosis

  • The Sarah Taylor Story – A Chiari Warrior’s Journey

    The Sarah Taylor Story – A Chiari Warrior’s Journey

    When I first started getting hit with symptoms, I was a divorced, single mother of three amazing kids; responsible not only to provide for them but to see them through life, unscathed by life’s situations, and showing them that there was nothing that if they worked hard at something, nothing could hold them back. I had just started to expand in my career as a self-taught auto technician. I was a woman making a place for herself in an industry traditionally dominated by males. July 3, 2015, was the day that my life forever changed. I was brought to the hospital with stroke-like symptoms. I was having visual problems. I couldn’t walk or talk. I had no idea who I was or where I was. The whole right side of my body basically stopped working and the right side of my face was droopy. I was brought to the ER and before the doctor would even try to figure out what was wrong with me, he ordered a series of drug tests. I passed every test, so he finally admitted to me. Once on the neurology floor, more testing was done. They performed an MRI, MRA, EKG and told us that all results were normal. I later discovered that was not the case.

    One doctor refused to believe that I was not on drugs. She noted in my file that while she has no evidence to support it, she believed that I am on a drug that they hadn’t screened for, based solely on “my age, single mom status, and prior good health.” She also noted that they found a Chiari, but that based on my symptoms, she believed it was irrelevant (an incidental finding). I would love to see her now and show her just how very wrong she was. I firmly believe that what she put in my medical chart is why I have had such a difficult time getting the care that I need and deserve.

    A few days later, I followed up with my PCP. She went over my MRI results with me and pointed out that they found a Chiari Malformation with a 19mm herniation of my cerebellar tonsils. She told me of changes in my white matter that the radiologist said needed to be “further evaluated” and referred me to my first neurologist, who I met within August. He ordered a visual evoked potential and an EEG. Both come back normal, so he diagnosed me with migraines, even after hearing my symptoms, which frustrates me even more as I know that it is not migraines causing these issues.

    At this point, I switched my neurology care to another hospital. They went over my history with me and ordered a lumbar puncture to rule out Multiple Sclerosis, which showed banding in my spinal fluid. On September 14, 2015, I was officially diagnosed with Multiple Sclerosis and opted to begin treatment and was to start on Plegridy. As I started the full doses I started breaking out into hives. The docs didn’t seem to think I should worry, so I called the drug manufacturer and they said it should be considered an allergic reaction to the Plegridy, and to discontinue using it and advise my doctor.

    After this experience, I switched care back to the first hospital for neurology to get a second opinion. The new neurologist ordered a new brain MRI and one of my cervical spine. There were no changes to my brain MRI, but my cervical imaging showed a syrinx. They weren’t sure if the syrinx was of any significance. So, she referred me to the only MS specialist in North Dakota whom I would meet with, in May. The MS specialist took a complete history on me and ran a bunch of blood work to rule out other illnesses. When those illnesses were all ruled out, she diagnosed me with Radiologic Isolated Syndrome (which means that they saw similar characteristics to MS in my imaging, without MS symptoms). While in her care I continued to get worse, with symptoms progressed to include pins and needles feeling in my hands and feet, occipital headaches that drop me to the ground, cognitive decline, fatigue, weakness, some random numbness, and muscle spasms. She ordered a new MRI and once again no changes were indicated. She began to question if my Chiari was behind my growing number of symptoms. She tried to refer me to Mayo, but my insurance declined her referral.

    Eventually, I started having issues walking and my gait was becoming increasingly unsteady, so I return to a local neurology clinic. They did an MRI on my brain, cervical and thoracic spine. They found a syrinx in my thoracic spine and once again they doubted the significance, along with a slight scoliosis convex. When asked what a syrinx was, they told me that it was “an old MS lesion.” I later learned that a syrinx is a cyst inside of the spinal cord caused by a blockage of cerebrospinal fluid and it damages the spinal cord from the inside out – often associated with Chiari Malformation.

    During this care for MS, I kept having what they thought were MS relapses, roughly every three to four months. Each time they ordered new MRI images and treated me with high doses of IV steroids for five days in a row. Never once did this imaging ever show an actual MS-relapse or MS activity. I continually had issues with every medication that they put me on to help “try to delay the progression of the MS” (the MS that I never had). In November 2017 I started Ocrevus, which was just FDA approved that year. Around this time, I started having strange symptoms and thought them just to be side effects of the medication, not realizing that something else might be causing it all. I met with my neurologist before my second full dose and I told her everything that I was experiencing. We opted to take me off the Ocrevus and they repeated the MRI yet again. Again, the MRIs show absolutely nothing new for activity and she admits that she doesn’t know what to do for me. I am three years in at that point and never once have they seen any MS activity.

    I made an appointment with yet another neurologist. I met with him on March 2019 and he immediately pulled my MS diagnosis. He instead decides that I have migraines and anxiety. He believes that anxiety is why I am completely numb all over my body. He disregards the Chiari and the syrinxes when asked about them stating that they do not cause any symptoms that aren’t of any significance. I left this appointment more frustrated than I was before and began losing hope that I was ever going to be able to figure out what was going on with me. How am I ever going to get the proper treatment when I am consistently blown off whenever I ask about a condition that was noted from day one?

    I began working more closely with my PCP. I went over the last three years of my medical journey with her and told her that I felt that we really needed to dig into this Chiari Malformation that has been called out in my imaging since July of 2015, especially since I had many symptoms that may be from it. I told her about a neurosurgeon that I had been told about in Sioux Falls, SD, who specializes in Chiari. We also talk about a connective tissue disorder known as Ehlers-Danlos Syndrome and start comparing my symptoms (of which I had several). My PCP sends in referrals to the neurosurgeon, a genetic counselor, and a rheumatologist. (Because with Chiari you will more than likely have several comorbidities.)

    In June we traveled down to the specialist. He went over my MRI images and stated that my herniation was 19mm (which was almost quadruple the amount that they get concerned about). That coupled with my symptoms led to discussing the need for me to have decompression surgery. Finally, after four years we know the true culprit of what was wrong with me, my brain is literally falling out of my skull. We leave with a bunch of literature for the surgery and I call his office back Friday and tell them my decision to go forward with the surgery and we started planning for me to have surgery in early September. Just as we thought everything was on the right course, my insurance drops a bombshell on me. I received a call from the specialist office, and they tell me that my insurance has declined my surgery stating that I can have it done locally by the same incompetent neurosurgeon that I met who couldn’t even measure my Chiari correctly. I have appealed this decision twice and both times I was denied. I am now pushing for a State Fair Hearing.

    The last four years have been one hell of a ride when it comes to my health. My health problems have made it far more difficult to continue working on cars. As my symptoms wage war on my body, I am now forced to work on light duty and have been for the last two and a half years. I know that my days of working in a shop are coming to end as I just can’t handle the physical requirements of the job anymore. My quality of life in the last year alone has declined sharply. I used to be the energetic mom who could coach a sports team after working all day in the shop and still have the energy to keep up with the housework, now that is not the case. I manage to push on and get them to their activities, but I’m exhausted to the core. When this all began back in 2015 my kids were 8, 7, and 5. They are now 12, 11 and 9. At times I feel like I am a horrible mother because I miss the mom that I used to be. I miss the days when my kids weren’t worried about my health and when we could make plans with other families and keep them. I have lost so much of who I am thanks to the ignorance of some members of the medical community. I am losing faith in the medical profession in general. Male doctors have been the worst as I go through this journey, as women seem to have to first prove that it’s not psychosomatic before we’re worthy of being helped, even with imaging shows something to the contrary. When I present them with proven facts about Chiari Malformation, it still gets dismissed and it is extremely frustrating. The longer I go without receiving proper treatment, the more likely it becomes that some of this damage will become permanent and to me, that is not acceptable. I am fighting for my life and I will not back down until I receive the proper care, I can’t!

  • Overview: Craniocervical Instability and Related Disorders

    Overview: Craniocervical Instability and Related Disorders

    Craniocervical Instability and related pathologies of the craniocervical junction are an important topic for anyone diagnosed with Chiari 1 malformation. “Complex Chiari,” or the presence of craniovertebral abnormalities or instability in addition to the presence of cerebellar tonsillar herniation, is present in approximately one fourth of all cases of Chiari 1 malformation[1]. These cases usually involve the presence of a genetic connective tissue disorder and are thought by experts to be the cause of most Chiari decompression failures[2]. When the doctor and patient alike are not knowledgeable about these conditions and the additional symptoms that often accompany them, these more complex cases are often treated with a standard decompression, which can actually weaken the stability of the craniocervical junction more, and result in an increase of symptoms rather than a clinical improvement. Understanding what signs and symptoms to look for that may indicate that your Chiari is more complex, is vital in receiving the appropriate treatment the first time. This is especially important considering that, according to Chiari expert Paolo Bolognese, M.D., “[with revision surgeries], the results are not as good as if you had done the posterior decompression well the first time.”[3]

    Punjabi and White define instability as the “loss of the ability of the spine under physiological loads to maintain relationships between vertebrae in such a way that there is no damage or subsequent irritation of the spinal cord, (brain stem) or nerve roots, and in addition that there is development of deformity or incapacitating pain due to structural changes.”[4] This means that the ligaments and muscles that normally hold the spine together, are too weak or damaged to handle the normal range of motion and weight of anatomic structures. For example, in Craniocervical Instability, the neck is not strong enough to support the normal weight of the head, without elements of the spine moving in such a way that it causes pain or damage to the nervous system (spinal cord, brain stem, and even cranial nerves). The result is that the bones that make up the lower skull and upper spine get pushed out of their normal anatomic location and begin to impinge on or cause stretching of these parts of the nervous system.

    Craniocervical Instability can result from or be exacerbated by a trauma, such as a severe whiplash injury. However, many cases of CCI are associated with some sort of connective tissue disorder, such as a heritable disorder of connective tissue (HDCT, like Ehlers-Danlos Syndrome or Marfan’s), or an autoimmune condition that affects the connective tissue (such as Rheumatoid Arthritis), or a few other rarer conditions that affect the integrity of bony structures in the skull and spine. Instability can result either from lax ligaments and other connective tissues, soft bones (also seen in HDCTs) or from something like pannus formation, where repeated rubbing together of the joints causes a build-up of granulated tissue around bony structures and changes the way certain bones lie in relationship to one another[5]. Craniocervical Instability can also result as a complication of Chiari decompression surgery, when too much bone is removed from the skull, resulting in the instability of the skull on the top of the spine[6].

    In the patient community, the term “CCI” is often used in reference to both Craniocervical Instability and Atlantoaxial Instability (AAI). CCI is often used to refer to the commonly seen combination of issues with the craniocervical junction, that include the instability of the joints where the skull meets the C1 vertebrae (which is true CCI), the instability of the joints between C1 and C2 (true AAI), a retroflexed odontoid, pannus formation, and a kyphotic clivo-axial angle (which are all forms of basilar impression/invagination). But CCI really should refer to the movement of the skull with respect to the spine. This sliding is referred to as “translation” and is measured on dynamic imaging in millimeters. The pathological threshold for the degree of translation of the basion with respect to the odontoid process between flexion and extension is 2mm, and any amount of translation greater than 1mm is capable of producing symptoms7. Likewise, at the C1-C2 joint, instability in the form of AAI can cause an excessive uncovering of the joint facets. Facets are the surfaces of the vertebrae that articulate with next vertebra. An uncovering of the facets that exceeds 20% is considered pathological.

    The occipito-atlantic joint allows for about half of the cervical spine’s ability to flex and extend (tilt forward and backward). Likewise, the atlantoaxial joint [the articulation between C1 (atlas) and C2 (axis)] accounts for about half of the cervical spine’s ability to rotate the head. Because of this, these vertebrae lack the same amount of stability as the remainder of the spine, and ligaments are largely responsible for their stability[8]. Therefore, ligamentous laxity, as seen in connective tissue disorders, make these areas of the spine particularly prone to pathologic instability. Symptoms of AAI may include visual changes, syncope (fainting) or near-syncopal episodes, dizziness, nausea, facial pain, difficulty swallowing, choking, respiratory issues, and upper cervical tenderness. These symptoms will usually improve with the use of a neck brace[9]. For patients with connective tissue disorders, as are seen in 12-20% of patients diagnosed with Chiari, dynamic imaging is very important in identifying potential instability. The ideal tests to diagnose CCI and AAI are an upright MRI with flexion and extension and a 3D CT with rotational views, respectively[10]. It is important to note that ventral brain stem compression may not be seen on traditional supine MR imaging, while it may be very evident on dynamic imaging.

    Basilar Invagination and Basilar Impression are also often seen with instability. They are almost identical to one another, and refer to upward displacement of the bones of the spine. However, technically, Basilar Invagination is caused by this deformation with normal bone, while Basilar Impression results from softening of bone[11]. For our purposes, this distinction is less important, but we will discuss any displacement in terms of “Basilar Invagination,” or “BI” for short. Forms of Basilar Invagination now include the prolapse of the odontoid process through the foramen magnum (the original condition described by the term), cranial settling, a kyphotic clivo-axial angle, and a retroflexed odontoid[12]. The kyphotic clivo-axial angle is an important and relatively easy measurement to indicate potential deformative stress on the brain stem. The clivus is a wedge-shaped bone that normally lies above and ventral to the top of spine. When it lies more horizontally, it creates a sharp angle that results in a bending of the brainstem. The odontoid peg (also called the odontoid process or the dens) is the part of the C2 vertebrae, or Axis, that the skull pivots upon, so named because of its tooth-like shape. A retroflexed odontoid occurs when the odontoid is bent backwards, often compressing the front of the brain stem. Other important measurements involving ventral brain stem compression for a kyphotic clivo-axial angle and/or retroflexed odontoid include the Grabb-Oakes and Harris measurements.

    • The clivoaxial angle is measured by drawing a line along the posterior (back, or when lying more horizontal, the top) side of the lower clivus and intersecting that line with a line drawn on the posterior side of the axis.  If the angle created is less than 135°, it is considered pathological.  Like instability, a kyphotic clivoaxial angle is often seen in patients with connective tissue disorders and degenerative rheumatoid disease[13].  See figure 1 below.
    Left – Clivoaxial Angle (CXA). Right – Grabb-Oakes measurement.

    For the Grabb-Oakes measurement, a line is drawn from the basion (the midpoint of the anterior margin of the foramen magnum) to the inferior posterior C2. A perpendicular line is then drawn from the center of this line to the dura of the brain stem. A Grabb-Oakes measurement greater than 9 mm denotes a form of basilar invagination. This is a very helpful measurement for determining how much a retroflexed odontoid is compressing the brain stem. See Figure 2 above.

    The Harris measurement is the distance between the basion and the Posterior Axial Line. This distance should not be more than 12 mm. A measurement of more than 12 mm also denotes instability. This measurement can also be used to measure the translation between flexion and extension in dynamic imaging[14]. See Figure 3.

    Harris measurement

    Symptoms of ventral brain stem compression can occur with various types of BI and instability. They may be referred to together as a “cervicomedullary syndrome” and may include[15]:

    • A heavy headache (often referred to as feeling like a “bobblehead” or feeling like the head is a “bowling ball”)
    • A Chiari-type pressure headache aggravated by Valsalva maneuvers (because these conditions, like Chiari, can also cause flow issues)
    • Dysautonomia (including tachycardia, heat intolerance, orthostatic intolerance, syncope (fainting), polydipsia (extreme thirst), delayed gastric emptying, chronic fatigue)
    • Neck pain (often severe)
    • Central or mixed sleep apnea
    • Facial pain or numbness – Occasionally, including Trigeminal Neuralgia
    • Balance and coordination impairment
    • Muscle weakness
    • Dizziness and vertigo
    • Vision problems, including double vision and downward nystagmus
    • Reduced gag reflex and dysphagia (difficulty swallowing)
    • Tinnitus (ringing in the ears) and hearing loss
    • Nausea and vomiting
    • Paralysis
    • In more severe cases, non-epiform seizures have also been documented

    In addition to producing significant pain and neurological symptoms, the compression and kinking of the brain stem can cause significant injury to the brain stem neurons by stretching the axons of the nerves to the point that they break and recoil, producing what are called “axon retraction bulbs” that can be seen on microscopic examination of the cells. The stress placed on the brain stem by both compressing and stretching simultaneously is much greater than the mere sum of these two mechanisms. Interestingly, during the flexion of the normal spine, it stretches 17% of its length. Research has shown that the axon of a giant squid fails when stretched to 20% if its length. Therefore, the normal motion of the human neck brings us very close to injuring our brain stem. Consequently, it only takes a slight alteration of our normal anatomy to cause injury to these delicate nervous tissues[16].

    Treatment of Craniocervical Instability typically begins with more conservative medical management, such as neck bracing, activity limitation, physical therapy (including isometrics, sagittal balance, core strengthening and cardio), and pain management. Other causes of symptoms such as co-morbid conditions, multiple sclerosis, dystrophy, mitochondrial disorders, vitamin deficiencies and Lyme disease should be ruled out or treated. However, surgical intervention via a craniocervical fusion is indicated when the following criteria are met:

    Severe headache or neck pain >7/10
    AND cervicomedullary syndrome
    AND neurological deficits referable to the craniocervical junction
    AND radiological findings indicative of instability

    Surgeons and patients alike should consider surgery after medical management has been maximized and the patient has shown a positive response to neck bracing[10].

    Various specific surgical techniques are applied in craniocervical fusions. A more common technique is the open reduction and fusion stabilization procedure. This procedure involves stabilizing the head with screws, making an incision that exposes the occiput through C2, and fixing plates to the occiput which attach to the C1 and C2 (and sometimes C3) vertebrae with rods. A newer technique adapted by Dr. Paolo Bolognese is using a less invasive Chiari decompression surgery known as MIST (minimally invasive subpial tonsillectomy) along with a fusion using screws placed in the occipital condyles. Although the dura is opened to partially resect the tonsils, a duraplasty is not done. Advantages of this procedure include a smaller incision, smaller hardware, less bone removal, and a thicker bone for which to insert screws in the occiput. Risks of both methods include vertebral artery injury, and a slightly increased risk for segmental instability below the fusion, along with the standard risks of any surgical procedure, such as bleeding, infection, and complications from anesthesia. Both procedures demand the hands of a very skilled and experienced surgeon because vital structures lie in and around the area. Using condylar screws may increase the risk of injury to major vessels, particularly in the hands of a less experienced surgeon. An important cranial nerve also lies just deep to the occipital condyles, making precise screw placement extremely important. This may limit the procedure in becoming more widely used, but the resulting fusion may be stronger, despite the reduced amount of hardware[17].

    In the presence of a retroflexed odontoid, an open reduction, fusion and stabilization procedure may be enough to relieve ventral brain stem compression. However, in more severe cases, a further surgery called an odontoidectomy may be needed to remove the odontoid process. This surgery may be done through the mouth or the nose[18].

    Every Chiari patient should be aware of hereditary connective tissue disorders and the signs and symptoms of Craniocervical Instability and Basilar Invagination. Many neurosurgeons do not evaluate their patients for these conditions prior to performing Chiari decompression surgery, often resulting in the need for revision surgeries and poor results. Being an educated patient can help you ask the right questions and insist on the proper evaluation and testing to avoid the pitfalls that many other patients have faced.

    References:

    1 Bolognese, Paolo A, director. Surgical Techniques for Chiari Malformations. YouTube, American Syringomyelia Chiari Alliance Project, 16 Mar. 2015, <www.youtu.be/KfYmJnB6sPQ>.

    2 Bolognese, Paolo A. “Modern Classification and Subclassification of Chiari Malformations.”YouTube, American Syringomyelia Chiari Alliance Project, 16 Mar. 2015, <www.youtu.be/ZQ9ZmquN-M0>.

    3 Bolognese, Paolo A. “2016 ASAP CM/SM Conference – ‘Complex Posterior Fossa’ – Bolognese.” YouTube, American Syringomyelia Chiari Alliance Project, 7 Dec. 2016, <www.youtu.be/3jKH_DHadO8>.

    4 Augustus A. White III, Manohar M. Panjabi, et al. “Clinical Biomechanics of the Spine.” By Augustus A. White III, <www.leomed.at/listhoscan/white_90.pdf>

    5 The Pain Relief Foundation, The Pain Relief Foundation, <www.thepainrelieffoundation.com/craniocervical-instability/>.

    6 Bolognese, Paolo. Complex Posterior Fossa revisions. YouTube. December 7, 2016. <www.youtu.be/3jKH_DHadO8>.

    7 Menezes, Arnold H. “Craniovertebral Junction Anomalies: Diagnosis and Management.”Seminars in Pediatric Neurology, vol. 4, no. 3, Sept. 1997, <www.sempedneurjnl.com/article/S1071-9091(97)80038-1/fulltext>.

    8 Yang, Sun Y., et al. “A Review of the Diagnosis and Treatment of Atlantoaxial Dislocations.”Global Spine Journal, Georg Thieme Verlag KG, Aug. 2014, <www.ncbi.nlm.nih.gov/pmc/articles/PMC4111952/>.

    9 Henderson, Fraser C., et al. “Neurological and Spinal Manifestations of the Ehlers–Danlos Syndromes.” American Journal of Medical Genetics Part C: Seminars in Medical Genetics, <www.onlinelibrary.wiley.com/doi/10.1002/ajmg.c.31549/full>.

    10 Henderson, Sr. , Fraser C. “Neurological Management of Hereditary Disoders of Hypermobility Connective Tissue Disorders.” Ehlers-Danlos Society Annual Conference 2015. Ehlers-Danlos Society Annual Conference 2015, 14 Aug. 2015, Baltimore, <www.ehlers-danlos.com/2015-annual-conference-files/Henderson_0.pdf>.

    11 Hain, Timothy C. “Basilar Invagination, Basilar Impression and Atlantoaxial Subluxation.”Basilar Invagination, Basilar Impression and Atlantoaxial Subluxation, 19 Apr. 2013, <https://dizziness-and-balance.com/disorders/central/cerebellar/basilar_invagination.htm>.

    12 Kim, Louis J., et al. “JNS JOURNAL OF Neurosurgery OFFICIAL JOURNALS OF THE AANS since 1944.” Treatment of Basilar Invagination Associated with Chiari I Malformations in the Pediatric Population: Cervical Reduction and Posterior Occipitocervical Fusion | Journal of Neurosurgery: Pediatrics, Vol 101, No 2, Nov. 2004, <www.thejns.org/doi/abs/10.3171/ped.2004.101.2.0189?url_ver=Z39.88-2003&rfr_id=ori%3Arid%3Acrossref.org&rfr_dat=cr_pub%3Dpubmed>.

    13 Henderson, Sr. , Fraser C. “Cranio-Cervical Instability in Patients with Hypermobility Connective Disorders.” OMICS International, OMICS International, 18 Apr. 2016, <www.omicsgroup.org/journals/craniocervical-instability-in-patients-with-hypermobility-connective-disorders-2165-7939-1000299.php?aid=71754#11>.

    14 Bono, C M, et al. “Measurement Techniques for Upper Cervical Spine Injuries: Consensus Statement of the Spine Trauma Study Group.” Spine., U.S. National Library of Medicine, 1 Mar. 2007, <www.ncbi.nlm.nih.gov/pubmed/17334296>.

    15 Henderson, Sr. , Fraser C. “Diagnosis and Treatment of Craniocervical Instability in the Chiari Patient.” Chiari and Syringomyelia Foundation Educational Lecture. 20 July 2011, Greater Metropolitan Washington Area, Greater Metropolitan Washington Area, <www.youtu.be/U33T8JFXvk0>.

    16 Henderson, F C, et al. “Neuropathology of the Brainstem and Spinal Cord in End Stage Rheumatoid Arthritis: Implications for Treatment.” Annals of the Rheumatic Diseases, U.S. National Library of Medicine, Sept. 1993, <www.ncbi.nlm.nih.gov/pmc/articles/PMC1005138/>.

    17 Bolognese, Paolo A. “Surgical Techniques for Chiari Malformations.” YouTube, American Syringomyelia Chiari Alliance Project, 16 Mar. 2015, <www.youtube.com/watch?v=KfYmJnB6sPQ>.

    18 Hwang, Steven W., et al. “C1–C2 Arthrodesis after Transoral Odontoidectomy and Suboccipital Craniectomy for Ventral Brain Stem Compression in Chiari I Patients.”European Spine Journal, Springer-Verlag, Sept. 2008, <www.ncbi.nlm.nih.gov/pmc/articles/PMC2527411/>.