They are all different manifestations of Filum Disease. OR shares the cause of caudal traction produced by an excessively tense filum terminale with the Arnold-Chari Syndrome type I, idiopathic Syringomyelia and idiopathic scoliosis, as well as with other associated malformations of the occipital junction. The more intense and earlier this traction is applied, the greater the relevance of the bony manifestations such as odontoid retroflexion. This generates an anomalous spinal traction force that is transmitted from the coccyx to the axis (C2) and skull, via the filum terminale. The deformity found in odontoid retroflexion is due to a congenital mechanism of asynchrony in growth, in the embryonic phase, between the spinal cord and the central nervous system with the spinal column. – According to the Filum System ® health method: Like all anomalies of the cranio-cervical junction, odontoid retroflexion is conventionally attributed to congenital – structural or general/systemic issues – or acquired alterations. Note the enlargement of the supracerebellar space, evidence for the traction theory and against the theory of the malformation being due to a narrowing of the posterior fossa. Also: basilar impression, descent of the cerebellar tonsils, brainstem kinking. The diagnosis can be assessed by tracing the Thiébaut-Wackenheim-Vrousos basal line, which is a downward extension of the basal plane, and the odontoid process of the axis is usually tangential, or it is no more than two millimeters away from this line.įig.2.- Sagittal craniocervical MRI showing odontoid retroflexion. 2) of the skull or brain and cervical spine or cervical spinal cord. It may be involved in a chronic increase in intracranial pressure.Ĭomputed Axial Tomography (CT) or Magnetic Resonance Imaging (MRI)ĭiagnosis of odontoid retroflexion is radiological, and can be made by CT scan (Fig.1) or MRI (Fig. The neurological manifestations are typical of a compression of the upper cervical spinal cord: cervical pain, contractures, loss of strength, spasticity, paresis, gait instability, dysmetria and progressive loss of sensation. The symptoms of Odontoid Retroflexion are part of the Basilar Impression and Platybasia picture, the result of compression of the odontoid process on the brain stem and the immediate vascular structures. Suggested centres, associations and linksįig.1 Odontoid Retroflexion.SFT after laminectomy and catheter placment.SFT after suboccipital craniectomy (SOC).Testimonials from English speaking patients. ![]() Tethered cord with occult spina bifida or.
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