WordNet
- something abnormal or anomalous (同)miscreation
PrepTutorEJDIC
- (特に生物体の)奇形;{C}奇形部分
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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/05/20 22:58:13」(JST)
wiki en
| Chiari | |
|---|---|
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A sagittal FLAIR MRI scan, from a patient with an Arnold-Chiari malformation, demonstrating tonsillar herniation of 7 mm
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| Classification and external resources | |
| Specialty | Neurosurgery |
| ICD-10 | Q07.0 |
| ICD-9-CM | 348.4,741.0 |
| OMIM | 207950 |
| DiseasesDB | 899 |
| eMedicine | article/1483583 |
| Patient UK | Arnold–Chiari malformation |
| MeSH | D001139 |
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[edit on Wikidata]
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Chiari malformation, also known as Arnold–Chiari malformation, is a condition affecting the brain. It consists of a downward displacement of the cerebellar tonsils through the foramen magnum (the opening at the base of the skull), sometimes causing non-communicating hydrocephalus[1] as a result of obstruction of cerebrospinal fluid (CSF) outflow.[2] The cerebrospinal fluid outflow is caused by phase difference in outflow and influx of blood in the vasculature of the brain. It can cause headaches, fatigue, muscle weakness, difficulty swallowing (sometimes accompanied by gagging), choking and vomiting, dizziness, nausea, tinnitus, impaired coordination, neck pain, unsteady gait (problems with balance), poor hand coordination (fine motor skills), numbness and tingling of the hands and feet, and speech problems (such as hoarseness).
Less often, people with Chiari malformation may experience ringing or buzzing in the ears (tinnitus), weakness, slow heart rhythm, curvature of the spine (scoliosis) related to spinal cord impairment, abnormal breathing, such as central sleep apnea, characterized by periods of breathing cessation during sleep, and, in severe cases, paralysis.[3]
Contents
- 1 Signs and symptoms
- 1.1 Syringomyelia
- 2 Pathophysiology
- 3 Diagnosis
- 3.1 Classification
- 4 Treatment
- 5 Epidemiology
- 6 History
- 7 Society and culture
- 7.1 Notable people diagnosed with Chiari malformation
- 8 References
Signs and symptoms
- Headaches aggravated by Valsalva maneuvers, such as yawning, laughing, crying, coughing, sneezing or straining, bending over, or getting up suddenly[4]
- Tinnitus (ringing in the ears)
- Lhermitte's sign (electrical sensation that runs down the back and into the limbs)
- Vertigo (dizziness)
- Nausea
- Nystagmus (irregular eye movements; typically, so-called "downbeat nystagmus")
- Facial pain
- Muscle weakness
- Impaired gag reflex
- Dysphagia (difficulty swallowing)[5]
- Restless leg syndrome
- Sleep apnea
- Sleep disorders[6]
- Impaired coordination
- Severe cases may develop all the symptoms and signs of a bulbar palsy
- Paralysis due to pressure at the cervico-medullary junction may progress in a so-called "clockwise" fashion, affecting the right arm, then the right leg, then the left leg, and finally the left arm; or the opposite way around.[citation needed]
- Papilledema on fundoscopic exam due to Increased intracranial pressure
- Pupillary dilation
- Dysautonomia: tachycardia (rapid heart), syncope (fainting), polydipsia (extreme thirst), chronic fatigue [7]
The blockage of cerebrospinal fluid (CSF) flow may also cause a syrinx to form, eventually leading to syringomyelia. Central cord symptoms such as hand weakness, dissociated sensory loss, and, in severe cases, paralysis may occur.[8]
Syringomyelia
Main article: Syringomyelia
Syringomyelia is a chronic progressive degenerative disorder characterized by a fluid-filled cyst located in the spinal cord. Its symptoms include pain, weakness, numbness, and stiffness in the back, shoulders, arms or legs. Other symptoms include headaches, the inability to feel changes in the temperature, sweating, sexual dysfunction, and loss of bowel and bladder control. It is usually seen in the cervical region but can extend into the medulla oblongata and pons or it can reach downward into the thoracic or lumbar segments. Syringomyelia is often associated with Chiari malformation type I and is commonly seen between the C-4 and C-6 levels. The exact development of syringomyelia is unknown but many theories suggest that the herniated tonsils in Chiari malformation type I form a "plug" which does not allow an outlet of CSF from the brain to the spinal canal. Syringomyelia is present in 25% of patients with Chiari malformation.[9]
Pathophysiology
The most widely accepted pathophysiological mechanism by which Chiari type I malformations occur is by a reduction or lack of development of the posterior fossa as a result of congenital or acquired disorders. Congenital causes include hydrocephalus, craniosynostosis (especially of the lambdoid suture), hyperostosis (such as craniometaphyseal dysplasia, osteopetrosis, erythroid hyperplasia), X-linked vitamin D-resistant rickets, and neurofibromatosis type I. Acquired disorders include space occupying lesions due to one of several potential causes ranging from brain tumors to hematomas.[10] Head trauma may cause cerebellar tonsillar ectopia, possibly because of dural strain.[citation needed] Additionally, ectopia may be present but asymptomatic until whiplash causes it to become symptomatic.[11] Posterior fossa hypoplasia causes reduced cerebral and spinal compliance.
Diagnosis
Diagnosis is made through a combination of patient history, neurological examination, and medical imaging.[12] Magnetic resonance imaging (MRI) is considered the best imaging modality for Chiari malformation since it visualizes neural tissue such as the cerebellar tonsils and spinal cord as well as bone and other soft tissues. CT and CT myelography are other options and were used prior to advent of MRI, however they characterize syringomyelia and other neural abnormalities less well.
By convention the cerebellar tonsil position is measured relative to the basion-opisthion line, using sagittal T1 MRI images or sagittal CT images.[13] The selected cutoff distance for abnormal tonsil position is somewhat arbitrary since not everyone will be symptomatic at a certain amount of tonsil displacement, and the probability of symptoms and syrinx increases with greater displacement, however greater than 5 mm is the most frequently cited cutoff number, though some consider 3–5 mm to be "borderline," and symptoms and syrinx may occur above that.[13][14][15] One study showed little difference in cerebellar tonsil position between standard recumbent MRI and upright MRI for patients without a history of whiplash injury.[11] Neuroradiological investigation is used to first rule out any intracranial condition that could be responsible for tonsillar herniation. Neuroradiological diagnostics evaluate the severity of crowding of the neural structures within the posterior cranial fossa and their impact on the foramen magnum. Chiari 1.5 is a term used when both brainstem and tonsillar herniation through the foramen magnum are present.[16]
The diagnosis of a Chiari II malformation can be made prenatally through ultrasound.[17][18]
Classification
In the late 19th century, Austrian pathologist Hans Chiari described seemingly related anomalies of the hindbrain; the so-called Chiari malformations I, II and III. Later, other investigators added a fourth (Chiari IV) malformation. The scale of severity is rated I – IV, with IV being the most severe. Types III and IV are very rare.[19]
| Type | Presentation | Clinical Features |
|---|---|---|
| I |
Can be congenital, or acquired through trauma. When congenital, may be asymptomatic during childhood, but often manifests with headaches and cerebellar symptoms. Herniation of cerebellar tonsils .[20][21][22] Tonsillar ectopia below the foramen magnum, with greater than 5 mm below as the most commonly cited cutoff value for abnormal position however this is somewhat arbitrary and controversial.[13][14][23][24] Syringomyelia of cervical or cervicothoracic spinal cord can be seen. Sometimes the medullary kink and brainstem elongation can be seen. Syndrome of occipitoatlantoaxial hypermobility is an acquired Chiari I malformation in patients with hereditary disorders of connective tissue.[25] Patients who exhibit extreme joint hypermobility and connective tissue weakness as a result of Ehlers-Danlos syndrome or Marfan syndrome are susceptible to instabilities of the craniocervical junction; thus they are at risk for acquiring a Chiari malformation. |
Headache, neck pain, unsteady gait usually during childhood [20] |
| II | Usually accompanied by a lumbar or lumbosacral myelomeningocele with tonsillar herniation below the foramen magnum.[20][26] As opposed to the less pronounced tonsillar herniation seen with Chiari I, there is a larger cerebellar vermian displacement. Low lying torcular herophili, tectal beaking, and hydrocephalus with consequent clival hypoplasia are classic anatomic associations.[27] The position of the torcular herophili is important for distinction from Dandy-Walker syndrome in which it is classically upturned. This is important because the hypoplastic cerebellum of Dandy-Walker may be difficult to distinguish from a Chiari malformation that has herniated or is ectopic on imaging. Colpocephaly may be seen due to the associated neural tube defect. | Paralysis below the spinal defect [20] |
| III | Associated with an occipital encephalocele containing a variety of abnormal neuroectodermal tissues. Syringomyelia and tethered cord as well as hydrocephalus is also seen.[20][28] | Abundant neurological deficits [20] |
| IV | Characterized by a lack of cerebellar development in which the cerebellum and brain stem lie within the posterior fossa with no relation to the foramen magnum. Associated with hypoplasia.[20][29] Equivalent to primary cerebellar agenesis.[30] | Not compatible with life [20] |
Syringomyelia associated with Chiari malformation
Other conditions sometimes associated with Chiari malformation include hydrocephalus,[31] syringomyelia, spinal curvature, tethered spinal cord syndrome, and connective tissue disorders[25] such as Ehlers-Danlos syndrome[32] and Marfan syndrome.
Chiari malformation is the most frequently used term for this set of conditions. The use of the term Arnold–Chiari malformation has fallen somewhat out of favor over time, although it is used to refer to the type II malformation. Current sources use "Chiari malformation" to describe four specific types of the condition, reserving the term "Arnold-Chiari" for type II only.[33] Some sources still use "Arnold-Chiari" for all four types.[34]
Chiari malformation or Arnold–Chiari malformation should not be confused with Budd-Chiari syndrome,[35] a hepatic condition also named for Hans Chiari.
In Pseudo-Chiari Malformation, Leaking of CSF may cause displacement of the cerebellar tonsils and similar symptoms sufficient to be mistaken for a Chiari I malformation.[36]
Treatment
While there is no current cure, the treatments for Chiari malformation are surgery and management of symptoms, based on the occurrence of clinical symptoms rather than the radiological findings. The presence of a syrinx is known to give specific signs and symptoms that vary from dysesthetic sensations to algothermal dissociation to spasticity and paresis. These are important indications that decompressive surgery is needed for patients with Chiari Malformation Type II. Type II patients have severe brain stem damage and rapidly diminishing neurological response.[37][38]
Decompressive surgery[39] involves removing the lamina of the first and sometimes the second or third cervical vertebrae and part of the occipital bone of the skull to relieve pressure. The flow of spinal fluid may be accompanied by a shunt. Since this surgery usually involves the opening of the dura mater and the expansion of the space beneath, a dural graft is usually applied to cover the expanded posterior fossa.
A small number of neurological surgeons[who?] believe that detethering the spinal cord as an alternate approach relieves the compression of the brain against the skull opening (foramen magnum), obviating the need for decompression surgery and associated trauma. However, this approach is significantly less documented in the medical literature, with reports on only a handful of patients. It should be noted that the alternative spinal surgery is also not without risk.[citation needed]
Complications of decompression surgery can arise. They include bleedings, damage to structures in the brain and spinal canal, meningitis, CSF fistulas, occipito-cervical instability and pseudomeningeocele. Rare post-operative complications include hydrocephalus and brain stem compression by retroflexion of odontoid. Also, an extended CVD created by a wide opening and big duroplasty can cause a cerebellar "slump". This complication needs to be corrected by cranioplasty.[37]
In certain cases, irreducible compression of the brainstem occurs from in front (anteriorly or ventral) resulting in a smaller posterior fossa and associated Chiari malformation. In these cases, an anterior decompression is required. The most commonly used approach is to operate through the mouth (transoral) to remove the bone compressing the brainstem, typically the odontoid. This results in decompressing the brainstem and therefore gives more room for the cerebellum, thus decompressing the Chiari malformation. Arnold Menzes, MD, is the neurosurgeon who pioneered this approach in the 1970s at the University of Iowa. Between 1984 and 2008 (the MR imaging era), 298 patients with irreducible ventral compression of the brainstem and Chiari type 1 malformation underwent a transoral approach for ventral cervicomedullary decompression at the University of Iowa. The results have been excellent resulting in improved brainstem function and resolution of the Chiari malformation in the majority of patients. On April 24, 2009, a young patient with type 1 Chiari malformation was successfully treated with a minimally invasive endoscopic transnasal procedure followed by a posterior decompression and fusion by Richard Anderson and colleagues at the Columbia University Medical Center Department of Neurosurgery.[40] This technique was later published by Hankinson and colleagues in the Journal of Neurosurgery.[41]
Epidemiology
The prevalence of congenital Chiari I malformation, defined as tonsilar herniations of 3 to 5 mm or greater, was previously believed to be in the range of one per 1000 births, but is likely much higher.[25][42] Women are three times more likely than men to have a congenital Chiari malformation.[43] Type II malformations are more prevalent in people of Celtic descent.[42] A study using upright MRI found cerebellar tonsillar ectopia in 23% of adults with headache from motor-vehicle-accident head trauma. Upright MRI was more than twice as sensitive as standard MRI, likely because gravity affects cerebellar position.[11]
Cases of congenital Chiari malformation may be explained by evolutionary and genetic factors. Typically, an infant's brain weighs around 400g at birth and triples to 1100-1400g by age 11. At the same time the cranium triples in volume from 500 cm3 to 1500 cm3 to accommodate the growing brain.[44] During human evolution, the skull underwent numerous changes to accommodate the growing brain. The evolutionary changes included increased size and shape of the skull, decreased basal angle and basicranial length. These modifications resulted in significant reduction of the size of the posterior fossa in modern humans. In normal adults, the posterior fossa comprises 27% of the total intracranial space, while in adults with Chiari Type I, it is only 21%.[45] If a modern brain is paired with a less modern skull, the posterior fossa may be too small, so that the only place where the cerebellum can expand is the foramen magnum, leading to development of Chiari Type I.[46] H. neanderthalensis had platycephalic (flattened) skull. Some cases of Chiari are associated with platybasia (flattening of the skull base).[47]
History
The history of Chiari malformation is described below and categorized by the year:
- 1883: Cleland was the first to describe Chiari II or Arnold–Chiari malformation on his report of a child with spina bifida, hydrocephalus, and anatomical alterations of the cerebellum and brainstem.[48]
- 1891: Hans Chiari, a Viennese pathologist, described the case of a 17-year-old woman with elongation of the tonsils into cone shaped projections which accompany the medulla and are crammed into the spinal canal.[48]
- 1907: Schwalbe and Gredig, pupils of German pathologist Julius Arnold, described four cases of meningomyelocele and alterations in the brainstem and cerebellum, and gave the name "Arnold-Chiari" to these malformations.[48][49]
- 1932: Van Houweninge Graftdijk was the first to report the surgical treatment of Chiari malformations. All patients died from surgery or postoperative complications.[48]
- 1935: Russell and Donald suggested that decompression of the spinal cord at the foramen magnum might facilitate the CSF circulation.[48]
- 1940: Gustafson and Oldberg diagnosed Chiari malformation with syringomyelia.[48]
- 1974: Bloch et al. described the tonsils position to be classified between 7 mm and 8 mm below cerebellum.[48]
- 1985: Aboulezz used MRI for discovery of extension[48]
Society and culture
The condition was brought to the mainstream on the series CSI: Crime Scene Investigation in the tenth-season episode "Internal Combustion" on February 4, 2010.[50] Chiari malformation was briefly mentioned on the medical drama House M.D. in the fifth season episode "House Divided"[51] and it was the focus of the sixth season episode "The Choice." It is also the focus of Private Practice Season 4 episode 4, where a pregnant woman is diagnosed with it. It was also mentioned in the medical drama A Gifted Man, in the first season episode "In Case of Separation Anxiety.".[52] Chairi malformation has also been featured in non-fiction TV shows. Season 5, Episode 2 of Extreme Makeover: Home Edition features a family where both mom and daughters have Chiari malformation. On the Discovery Health Channel's series Mystery Diagnosis, a young girl is diagnosed with Chiari malformation and Ehlers-Danlos syndrome in the first season episode "Blood and Fire".
Notable people diagnosed with Chiari malformation
- Rosanne Cash[53] – U.S. singer-songwriter; daughter of Johnny Cash
- Julia Clukey[54] – U.S. luge competitor for Team USA in 2010 Vancouver Winter Olympics
- Joanna David[55] – British television and stage actress
- J. B. Holmes[citation needed] – U.S. professional golfer
- Marissa Irwin[56] – U.S. fashion model with Chiari secondary to Ehlers-Danlos syndrome
- Bobby Jones[57] – U.S. World Golf Hall of Fame golfer and founder of the Augusta National Golf Club
- Leah Shapiro[58] – U.S. drummer for the band Black Rebel Motorcycle Club
- Michelle Stilwell – Canadian wheelchair racer and politician[59]
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UpToDate Contents
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- 1. キアリ奇形 chiari malformations
- 2. 脊髄髄膜瘤（二分脊椎）の病態生理および臨床症状 pathophysiology and clinical manifestations of myelomeningocele spina bifida
- 3. 神経管欠損症の超音波診断 ultrasound diagnosis of neural tube defects
- 4. 脊髄髄膜瘤（二分脊椎）マネージメントの概要 overview of the management of myelomeningocele spina bifida
- 5. 耳鳴の病因および診断 etiology and diagnosis of tinnitus
English Journal
- Magnetic resonance imaging features of complex Chiari malformation variant of Chiari 1 malformation.
- Moore HE1, Moore KR.
- Pediatric radiology.Pediatr Radiol.2014 Jun 5. [Epub ahead of print]
- BACKGROUND: Complex Chiari malformation is a subgroup of Chiari 1 malformation with distinct imaging features. Children with complex Chiari malformation are reported to have a more severe clinical phenotype and sometimes require more extensive surgical treatment than those with uncomplicated Chiari
- PMID 24898393
- The complex Chiari malformation: an evolution of understanding.
- Brockmeyer D.
- Pediatric radiology.Pediatr Radiol.2014 Jun 5. [Epub ahead of print]
- PMID 24898392
- Chiari type 1 malformation in a pseudotumour cerebri patient: is it an acquired or congenital Chiari malformation?
- Istek S.
- BMJ case reports.BMJ Case Rep.2014 Jun 4;2014. pii: bcr2013201845. doi: 10.1136/bcr-2013-201845.
- Chiari malformation type 1 (CM1) is a developmental abnormality of the cerebellar tonsils. Patients with CM1 commonly present with headache. Papilloedema is rarely seen in CM1. However, a 52-year-old woman presented to the hospital with a headache and her ophthalmological examination revealed bilate
- PMID 24898995
Japanese Journal
- Orbital Emphysema Causing SyncopeChiari Malformation with Thick Occipital Bone
- Yasuhara Takao,Miyoshi Yasuyuki,Date Isao
- Acta Medica Okayama 65(1), 59-61, 2011-02
- … A case of a Chiari malformation with an extraordinarily thick occipital bone is described. … This case gives us the essence of the occurrence mechanisms of Chiari malformation and foramen magnum decompression. …
- NAID 120002807414
- Subacute Subdural Hygroma and Presyrinx Formation After Foramen Magnum Decompression With Duraplasty for Chiari Type 1 Malformation : —Case Report—
- SUZUKI Fumio,KITAGAWA Tadashi,TAKAGI Kenji,NOZAKI Kazuhiko
- Neurologia medico-chirurgica 51(5), 389-393, 2011
- … A 15-year-old girl developed a rare case of subdural hygroma after foramen magnum decompression for Chiari type 1 malformation manifesting as rapid symptom deterioration around 10 days after uncomplicated operation with uneventful immediate postoperative course. …
- NAID 130000897416
Related Links
- Chiari Malformation- A Comprehensive site providing information on Chiari Malformation and related topics ... Conquer Chiari is looking for volunteers to participate in an ongoing research project. The information collected will be used ...
- Chiari Malformation - The Chiari Institute provides treatment of Chiari malformation, which refers to a complex group of disorders characterized by herniation of the cerebellum through the large opening in the base of the skull into the ...
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★リンクテーブル★
| リンク元 | 「キアリ奇形」 |
| 関連記事 | 「malformation」 |
「キアリ奇形」
- 英
- Chiari malformation
- 同
- Chiari奇形、アーノルド-キアリ症候群 Arnold-Chiari syndrome、アーノルド・キアリ奇形 Arnold-Chiari奇形 Arnold-Chiari malformation、キアリ-アーノルド奇形 Chiari-Arnold malformation
概念
- 小脳や脳幹が大後頭孔を通じて脊椎管内に下垂した先天性奇形の総称である。
定義
- 先天性水頭症を伴う小脳奇形の4型 → アーノルド・キアリ奇形(1891年Chiariが記載) → 後脳奇形全体をまとめてアーノルド・キアリ症候群とよぶ
- アーノルド・キアリ奇形はキアリ奇形II型を指す。
Chiari奇形I型とChiari奇形II型。その他
- SCN.282改変
| I型 | II型 | III型 | IV型 | |
| 脊柱管への陥入 | 小脳扁桃 | 延髄、 第四脳室、 小脳虫部 |
(頚部の二分脊椎部に 小脳が陥入(脳瘤) 。 延髄下垂。水頭症) |
(小脳の形成不全) |
| 発症年齢 | 小児、成人 | 乳幼児 | ||
| 臨床症状 | 非特異的 | 喉頭喘鳴、 無呼吸発作、 嚥下困難 |
||
| 水頭症 | ＋ | ＋＋＋ | ||
| 脊髄髄膜瘤 | － | ＋＋＋ | ||
| 脊髄空洞症 | ＋＋ | ＋ |
病型 SOR.437
I型
- 小脳扁桃の下垂
- (MRI像、頭蓋底陥入症、脊髄空洞症合併が見られる。矢頭は小脳扁桃)
- 脊髄空洞症を伴いやすい
II型
異常部位
| 大脳 | 脳梁形成不全、大脳鎌形成不全、小多脳回 |
| 小脳 | 下垂 |
| 中脳 | 中脳水道の閉塞 |
| 橋 | |
| 延髄 | 下垂 |
| 脳室 | 水頭症(ほぼ全例)(側脳室・第3脳室の拡大、側脳室後角の拡大) |
| 脊椎 | 脊髄髄膜瘤(ほぼ全例) |
III型
- 頚部の二分脊椎部に小脳が陥入(脳瘤)。延髄下垂。水頭症
IV型
- 小脳の形成不全
症状
- I型：咳嗽、くしゃみ、怒責により頭蓋内圧が亢進して頭痛を来す。
- II型：脳幹症状(吸気時喘鳴、無呼吸発作、嚥下障害、水頭症に伴う脳室拡大。)
検査
- 脳幹から頸椎にわたって矢状断を撮像する。
治療
- 頭蓋内圧が高い場合には脳室シャント術を行う
- 後頭下減圧術(大孔減圧術)である
「malformation」
- n.
- 形成異常、奇形
-malformation L. 138