Congenital atlantoaxial luxation associated with malformation of the dens axis in a Quarter Horse foal

Witte, Stefan; Alexander, Kate; Bucellato, M.; Sofaly, C. D.; Wp, Fife; Hinchcliff, Kenneth W.

doi:10.1111/j.2042-3292.2005.tb00364.x

Cited by 11 publications

(18 citation statements)

References 8 publications

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“…19 Congenital luxation of the atlanto-axial articulation has also been described, resulting in signs of severe spinal ataxia and weakness in a neonate. 20 Clinical neurological signs in affected individuals can vary in onset and severity. Some affected horses may have only scoliosis without neurologic gait deficits.…”

Section: Occipito-atalanto-axial Malformationmentioning

confidence: 99%

Congenital Malformation of the Nervous System

Furr¹

2007

Equine Neurology

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Section: Occipito-atalanto-axial Malformationmentioning

confidence: 99%

Congenital Malformation of the Nervous System

Furr¹

2007

Equine Neurology

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“…O ccipitoatlantoaxial (OAA) dislocation is not common in the horse; however, to date, few case reports have been published with congenital or acquired (trauma) primary causes. Congenital OAA malformation is rare and is described primarily in Arabian breeds, although other breeds have also been reported over recent years . The vertebral structures, particularly the dens, may be malformed leading to an unstable joint and subsequent sub‐ or luxation.…”

Section: Introductionmentioning

confidence: 99%

“…Atlantoaxial subluxation can be suspected clinically, but diagnostic imaging is mandatory for pre‐mortem confirmation. The typical features include malalignment of the atlas and axis, with ventral displacement of the axis in most instances . Variable degrees of axial rotation of the axis and/or atlas may be present .…”

Section: Introductionmentioning

confidence: 99%

“…Computed tomography may provide additional information about the bony structures . However, soft tissue structures, such as the supporting atlantooccipital ligaments, cannot be assessed with radiography or CT.…”

Section: Introductionmentioning

confidence: 99%

“…O CCIPITOATLANTOAXIAL (OAA) dislocation is not common in the horse; however, to date, few case reports have been published with congenital [1][2][3][4][5][6] or acquired (trauma) 7-12 primary causes. Congenital OAA malformation is rare and is described primarily in Arabian breeds, 1,2 although other breeds have also been reported over recent years.…”

Section: Introductionmentioning

confidence: 99%

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3 Tesla Magnetic Resonance Imaging of the Occipitoatlantoaxial Region in the Normal Horse

Gutiérrez-Crespo

Kircher

Carrera

2013

Vet Radiology Ultrasound

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The aim of this study was to describe the appearance of the ligamentous structures of the occipitoatlantoaxial (OAA) region in the normal horse by 3 tesla (3T) magnetic resonance imaging (MRI). The MRI images of the longitudinal odontoid ligament, tectorial membrane, dorsal and ventral atlantoaxial ligaments, dorsal atlantooccipital membrane with its reinforcing ligaments, and the lateral atlantooccipital ligaments of 10 horse cadavers were evaluated. All ligaments and membranes were identified in all planes, except for the lateral atlantooccipital ligament in the sagittal plane due to its cranioventrolateral course. All were iso to mildly hypointense to musculature of the neck in T1W with the exception of the tectorial membrane that was moderately hypointense; moderately hypointense in PD-SPIR, and markedly hypointense (isointense to cortical bone) in T2W. The PD-SPIR was the best sequence to identify all ligaments and membranes from their cranial and caudal attachments. The longitudinal odontoid ligament, ventral atlantoaxial ligament, and reinforcing bands of the dorsal atlantooccipital membrane presented a characteristic striped heterogeneous signal behavior thought to be due to fibrocartilaginous content. The remaining ligaments and membranes showed homogeneous signal intensity. Special anatomical features in this species such as the fan-shaped longitudinal odontoid ligament, absence of the transverse ligament and presence of the ventral atlantoaxial ligament were documented. Ligamentous structures that stabilize the equine OAA region were described with MRI in this study and these findings could serve as an anatomic reference for those cases where instability of this region is suspected.

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Congenital Malformationof the Nervous System

Furr

Reed

2015

Equine Neurology

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Congenital atlantoaxial luxation associated with malformation of the dens axis in a Quarter Horse foal

Cited by 11 publications

References 8 publications

Congenital Malformation of the Nervous System

Congenital Malformation of the Nervous System

3 Tesla Magnetic Resonance Imaging of the Occipitoatlantoaxial Region in the Normal Horse

Congenital Malformationof the Nervous System

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