Posterior inferior cerebellar artery (PICA) is one of the three vessels that provide arterial supply to the cerebellum. It is the most variable and tortuous cerebellar. English Translation, Synonyms, Definitions and Usage Examples of Spanish Word ‘arteria cerebelosa posteroinferior’. Reporte de caso RESUMEN Los aneurismas que se forman de la ACPI (arteria cerebelosa posteroinferior) son poco comunes, la inci-dencia que se reporta es.

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As in other instances of hydrocephalus-associated syringomyelia, the initial treatment for hydrocephalus in our patient was aimed at alleviating the raised intracranial pressure to prevent the risk of acute cerebellar herniation that can occur during the posterior cerebslosa procedure. Cerebellumchoroid plexus of the fourth ventricle. Definition NCI A syndrome caused by an infarct in the vertebral or posterior inferior cerebellar artery.

According to Gardner’s theory the primary cerebelosz consists of an imperforation of the rhombic roof, the supratentorial raised intracranial pressure displaces the tentorium and a shallow posterior fossa posteroifnerior Dynamic CSF flow study in the pathophysiology of syringomyelia associated with arachnoid cysts of the posterior fossa. Chiari Type I malformation is often described as the caudal displacement of the cerebellar tonsils below the level of the foramen magnum with or without syringomyelia 1, Severe occlusion of this artery or to vertebral arteries could lead to Horner’s Syndrome as well.

From Wikipedia, the free encyclopedia. Deep reflexes could not be elicited on the right arm.

Posterior inferior cerebellar artery

Endoscopic fenestration of posterior fossa arachnoid cyst for the treatment of presyrinx myelopathy. On 3 Augustan endoscopic third ventriculostomy was performed, after which the headaches markedly improved. In our literature review, we found 15 cases of syringomyelia accompanying diverse cystic processes of the posterior cranial fossa, such as congenital arachnoid cysts, Dandy-Walker malformation, Blake’s pouch cyst, and posttraumatic CSF pouches, which are summarized in the Table ,10, Disease or Syndrome T Ten patients had hydrocephalus of diverse severity that would contribute to the formation of the hydromyelic cavity.


Posterior fossa arachnoid cysts can result in acquired Chiari malformation and syringomyelia.

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J Neurosurg ; Neurosurg Focus ; 19 5 E The posterior inferior cerebellar artery PICAthe largest branch of the vertebral arteryis one of the three main arterial blood supplies for the cerebellumpart of the brain. Occlusion of the posterior inferior cerebellar artery or one of its branches, or of the vertebral artery leads to lateral medullary syndrome also called Wallenberg syndrome.

A syndrome caused by an infarct in the vertebral or posterior inferior cerebellar artery. MRI performed 10 months after posterior fossa decompression and cyst excision illustrating a reduction in the size of the arachnoid cyst and normal intracranial position of the cerebellar tonsils, and b marked shrinkage of the intramedullary cavity.

Preoperative MRI study of the patient showing: In all these cases, there was a coexistent syringomyelia 2,3,10, Implications for diagnosis and treatment. There have been several reports of large arachnoid cysts associated with syringomyelia ,10, Histopathological study of the excised tissues showed flattened cells of meningothelial origin on a loose fibrous wall with normal vessels.

Computerized tomography cerebral scan disclosed the presence of hydrocephalus.

However, a MRI argeria showed normalization of the cerebellar tonsils’ position and a significant shrinkage of the cervicothoracic syringomyelic cavity Fig. Neurosurg Focus ;11 1 article 2. In most published cases the syringomye lia has been attributed to obstruction of CSF flow at theforamen magnum by the arachnoid cyst itself.

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Started inthis collection now contains interlinked topic pages divided into a tree of 31 specialty books and chapters. Arteries of the head and neck. Surg Neurol ; In these cases there exists a pressure gradient across the cranial and spinal compartments, due either to increased intracranial pressure, as happens in supratentorial masses or hydrocephalus, or to CSF diversion into the spinal compartment.


Arachnoid cysts are benign collections of cerebrospinal fluid CSF that develop as the result of an abnormal duplication of the arachnoid membranes during brain development. As in other instances of syringomyelia, we recommend to address the surgical management in accordance with the hypothetical underlying mechanism. Regression of syringomyelia and tonsillar herniation after posterior fossa arachnoid cyst excision. Related Bing Images Extra: Related Topics in Cardiovascular Medicine.

Although hydrocephalus was a contributing factor, the Chiari malformation and the syringomyelic cavity in our case must be the consequence of the pressure exerted by the retrocerebellar cyst, as demonstrated by the resolution of the tonsillar descent and the syringomyelia following osseous decompression and surgical excision of the cyst walls. It winds backward around the upper part of the medulla oblongatapassing between the origins of the vagus nerve and the accessory nerveover the inferior cerebellar peduncle to the undersurface of the cerebellumwhere it divides into two branches.

Motor power and ability were diminished on his upper extremity but there was no atrophy.

Posterior inferior cerebellar artery – Wikipedia

A disrupted blood supply to this artery due to a blood clot or embolus will result in tissue damage and lead to lateral medullary syndromealso known as posterior inferior cerebellar artery syndrome PICA syndromeor Wallenberg syndrome. Descompresion del agujero magno. Posterior fossa arachnoid cysts roughly represent one fourth of all these congenital pouches.

There is only one previous report of a posterior fossa arachnoid cyst producing tonsillar descent and syringomyelia. After endoscopic third ventriculostomy, the patient was submitted to foramen magnum decompression and arachnoid cyst removal that were followed by resolution of both the Chiari malformation and the syringomyelia.