It's the decent of the cerebral tonsils through the Forman magnum. Aka low lying c.t. , chiari 0 or 1, brain herniation. It can cause many symptoms! And there is no cure, sometimes surgery works but not promising. No doctors really give it credit and say it can't cause a lot of the symptoms people with it complain about, except I find it funny no one with this knows one another but has the same story to tell. So anyways, if you have it and have symptoms you are pretty much f***ed cause no one knows $#¡+ about it. Haha!! Upright health website has great information on it. Check it out!
Tonsillar ectopia is a congenital problem in which a portion of the cerebellum sits within the foramen magmum. It is similar to a Chiari malformation or an Arnold-Chiari malformation.
The website below has MRI images of cerebellar tonsillar ectopia. http://www.flickr.com/photos/77814749@N00/269706530/in/set-72157594546007849/
Arnold Chiari malformation
inflammation of both ears with tonsillar and adenoidal inflammation
controlling basic functions such as breathing, heart rate, and blood pressure
An area of the cerebral or cerebellar surface on which lesions cause no sensory or motor symptoms.
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The website below has MRI images of cerebellar tonsillar ectopia. http://www.flickr.com/photos/77814749@N00/269706530/in/set-72157594546007849/
developmental cerebellar tonsillar ectopia is a finding that may be associated with exertional headache or headache precipitated by Valsava maneuver or coughing
Cerebellar tonsillar ectopia refers to a brain condition. In this condition, the tonsils near the back of the skull lay low causing herniation.
Cerebellar Tonsillar Ectopia refers to a hernia of the cerebellum in the brain. This condition is also known as a Chiari Malformation. It is corrected through a surgical process to decompress the brain.
at the base of the scull at the back is tonsills that space can become crowded and the tonsills lie low ,
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It may be a normal finding, depending on the clinical history. It may also represent a congenital disorder or, something worse, like an intracranial mass or edema. The clinical history is important. If the radiologist though the ectopia was an important diagnostic clue, more emphasis would be placed with recommendations.
Tonsillar herniationIn tonsillar herniation, also called downward cerebellar herniation,[4] or "coning", the cerebellar tonsils move downward through the foramen magnum possibly causing compression of the lower brainstem and upper cervical spinal cord as they pass through the foramen magnum.[5]Increased pressure on the brainstem can result in dysfunction of the centers in the brain responsible for controlling respiratory and cardiac function. Tonsillar herniation of the cerebellum is also known as a Chiari Malformation (CM), or previously an Arnold Chiari Malformation (ACM). There are at least three types of Chiari malformation that are widely recognized, and they represent very different disease processes with different symptoms and prognosis. These conditions can be found in asymptomatic patients as an incidental finding, or can be so severe as to be life-threatening. This condition is now being diagnosed more frequently by radiologists, as more and more patients undergo MRI scans of their heads. Cerebellar ectopia is a term used by radiologists to describe cerebellar tonsils that are "low lying" but that do not meet the radiographic criteria for definition as a Chiari malformation. The currently accepted radiographic definition for a Chiari malformation is that cerebellar tonsils lie at least 5mm below the level of the foramen magnum. Some clinicians have reported that some patients appear to experience symptoms consistent with a Chiari malformation without radiographic evidence of tonsillar herniation. Sometimes these patients are described as having a 'Chiari [type] 0'.There are many suspected causes of tonsillar herniation including: decreased or malformed posterior fossa (the lower, back part of the skull) not providing enough room for the cerebellum; hydrocephalus or abnormal CSF volume pushing the tonsils out. Connective tissue disorders, such as Ehlers Danlos Syndrome, can be associated. GrantFor further evaluation of tonsillar herniation, CINE flow studies are used. This type of MRI examines flow of CSF at the cranio-cervical joint. For persons experiencing symptoms with seemingly Max herniation, especially if the symptoms are better in the supine position and worse upon standing/upright, an upright MRI may be useful.[2]
Ectopia lentis is the medical term for dislocation of the lens of the eye.
Middle cerebellar peduncle
It is the cerebellar vermis.