Acta Scientiae Veterinariae IF值2023-刊鹿论文编译

Sequestered Disc Herniation in a Dog

Abstract:

Background : Dogs are frequently affected by intervertebral disc degeneration, a structural failure associated with changes accelerated by aging. Disc degeneration may occur in the presence or absence of clinical signs, which are variable and common to other spinal cord diseases and therefore early diagnosis is crucial to a successful outcome. Treatment may be conservative or surgical according to severity of the clinical signs and should be combined with a rehabilitation protocol. Prognosis depends on the location of the spinal cord compression, volume and velocity of the disc material herniation and time between initial clinical signs, definitive diagnosis and therapeutic approach.\xa0 Case : A nonchondrodystrophic 14-year-old dog with acute clinical manifestation of paraparesis and proprioceptive deficit in hind limbs was submitted to myelography examination. There was contrast column deviation in the T13-L1 region, determining spinal compression, and spondyloses were also noted in several thoracolumbar vertebrae. Hemilaminectomy was performed with complete removal of the compressor fragment. Histological analysis confirmed the presence of fibrocartilaginous material that corresponds to the part of the annulus fibrosus. The kidnap of the fragment was characterized by loss of continuity with the remaining disk. In these cases, magnetic resonance imaging does provides the definitive diagnosis, since neoplasm, arachnoid cysts and abscesses may be remaining differential diagnosis. Therefore, surgical approach followed by histopathological analysis of the obtained material are necessary to confirm the diagnosis. Discussion : The present report differs from most cases of disc herniation because it is a thoracolumbar lesion with an acute manifestation of significant neurological deficit in an elderly dog of non-chondrodystophic breed. Also, material of the free fibrous annulus itself in the medullary canal is not a common histopathological presentation of disc extrusion usually composed by nucleus pulposus.\xa0 After neurolocalization of the lesion by clinical neurological examination, the radiographic evaluation shall precedes the myelography, since this is contraindicated when there is suspicion of discoespondylitis, fracture, dislocation or vertebral subluxation, which had not yet been discarded. Even if the MRI is performed, in the cases of a sequestered fragment, it still remais differential diagnoses include arachnoid cysts, discoespondylitis, hematomas, abscesses and neoplasms, including metastases, so only surgical approach to obtain material for histopathological analysis may provide definitive diagnosis. According to the histopathological examination, the herniated material had a fibrocartilaginous characteristic: several concentric fibrous blades, composed of collagen and fibrocartilage, thus characterizing the herniated material as a fragment of the fibrous ring. When removed from the vertebral canal, the contents did not show resistance, being withdrawn completely and without continuity with its origin intervertebral disc. The patient s disc herniation could not be classified as a disc protrusion because this affection is described as a projection of the fibrous annulus towards the vertebral canal due to the partial rupture of fibers and mineralization of the nucleus pulposus, without discontinuity of some content. Disc protrusion shows mild and progressive signs, except if there is complete rupture of the fibrous ring as can be seen in the sequestered disc herniation. Although infrequent, elderly animals of non-chondrodisiotic races may show acute signs of neurological deficits. Sequestrated disc herniation may mimic other lesions, requiring a surgical approach to obtain material for histopathological analysis to confirm the diagnosis.

Author Listing： José Ademar Villanova Junior;Guilherme Dipp;Bruno Parbelini Silva Neto;Janayna de Lima Maske Balardini;Juliano José Eigio Isaka;Mhayara Samile de Oliveira Reusing;Jair Rodini Engracia Filho

Volume： 47

Pages： None

DOI： 10.22456/1679-9216.95913

Language： English

Journal： Acta Scientiae Veterinariae

Acta Scientiae Veterinariae

ACTA SCI VET

影响因子：0.2

是否综述期刊：否

是否OA：否

是否预警：不在预警名单内

发行时间：2002

ISSN：1678-0345

发刊频率：Tri-annual

收录数据库：SCIE/Scopus收录

出版国家/地区：BRAZIL

出版社：Universidade Federal do Rio Grande do Sul

期刊介绍

ASV is concerned with papers dealing with all aspects of disease prevention, clinical and internal medicine, pathology, surgery, epidemiology, immunology, diagnostic and therapeutic procedures, in addition to fundamental research in physiology, biochemistry, immunochemistry, genetics, cell and molecular biology applied to the veterinary field and as an interface with public health.The submission of a manuscript implies that the same work has not been published and is not under consideration for publication elsewhere. The manuscripts should be first submitted online to the Editor. There are no page charges, only a submission fee.

ASV 关注的论文涉及疾病预防、临床和内科、病理学、外科、流行病学、免疫学、诊断和治疗程序的各个方面，细胞和分子生物学应用于兽医领域并作为公共卫生的接口。提交手稿意味着同一作品尚未出版，也未考虑在其他地方出版。稿件应首先在线提交给编辑。没有页面费用，只有提交费。

年发文量	121
国人发稿量	1
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自引率	0.0%
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平均审稿周期	较慢,6-12周
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偏重研究方向	VETERINARY SCIENCES-
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