Embryology of the craniocervical junction and posterior cranial fossa, part II: Embryogenesis of the hindbrain

Shoja, Mohammadali Mohajel; Ramdhan, Rebecca C.; Jensen, Chad J.; Chern, Joshua J.; Oakes, W. Jerry; Tubbs, R. Shane

doi:10.1002/ca.23048

Cited by 37 publications

(12 citation statements)

References 64 publications

(141 reference statements)

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“…Many different explanations of the pathogenesis of Chiari malformations have been proposed, but because a wide variety of anomalies can arise, no definitive account has yet been agreed [10]. Nevertheless, extensive evidence demonstrates that reduction of the posterior cranial fossa volume contributes to hindbrain herniation and the development of a Chiari 1 malformation in many cases [11,12]. Such decreases in volume have been associated with developmental abnormalities disrupting the rotation of the tentorium cerebelli and petrous bone during the embryonic, fetal, and postnatal periods, leading to an overcrowded posterior cranial fossa [11].…”

Section: Discussionmentioning

confidence: 99%

Chiari 1.5 malformation, accessory odontoid synchondrosis, and ventral compression: case report

et al. 2021

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The pathogenesis of Chiari 1 malformations has been explained in several different ways, but extensive evidence suggests a relationship between loss of volume within the posterior cranial fossa and Chiari 1 presentations. It is important to be able to differentiate Chiari 1.5 from Chiari 1 malformations as they have similar clinical presentations, but the latter have progressed further and are characterized by caudal herniations of the brain stem through the foramen magnum. Despite the similarities of presentation, Chiari 1.5 malformations have greater rates of complications following posterior decompression surgeries, which are typically performed to relieve ventral compression. An improved understanding of the odontoid synchondroses could lead to better understanding of Chiari malformations and lead to improved treatment of patients with these presentations. Here we present a rare case of an accessory odontoid synchondrosis in a patient with a Chiari 1.5 malformation and ventral compression.

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Section: Discussionmentioning

confidence: 99%

Chiari 1.5 malformation, accessory odontoid synchondrosis, and ventral compression: case report

et al. 2021

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“…This, coupled with a communication across the midline of the left and right transverse sinuses, resulted in a circular configuration in the region of the torcular. The development of the torcular occurs during the fourth to sixth months of gestation [ 8 - 10 ]. A series of transitional growth and regression patterns of primitive dural plexuses to dural sinuses occurs during this period.…”

Section: Discussionmentioning

confidence: 99%

A Cadaveric Case of a Circular Torcular Herophili

Lake¹,

Altafulla²,

Iwanaga³

et al. 2018

Cureus

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The torcular Herophili is formed by the joining of the straight sinus, superior sagittal sinus, and transverse sinus. The anatomic configuration of the torcular Herophili is highly variable. In the current literature, classification systems define up to nine subtypes of the torcular Herophili. The frequency of prevalence of these anatomical variants is also variable. Herein is a case report of a circularly-shaped torcular Herophili found during cadaveric dissection.

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“…Such anatomical variations are important for physicians to understand when evaluating patients with unusual physical examination findings [ 9 ]. Moreover, since there is no guarantee that a patient has a “normal” accessory nerve anatomy, it is important that surgeons are aware of the types of variations that might be encountered when working in the vicinity of this nerve so as to prevent unwanted complications [ 10 - 12 ].…”

Section: Discussionmentioning

confidence: 99%