title: Identification of ventrolateral intramedullary intervertebral disc herniation in a dog.
abstract: A 10-year-old male cross-breed dog was brought to Nihon University Animal Hospital with a  history of acute onset of paralysis in the pelvic limbs 13 days previously. Magnetic resonance  imaging revealed an intramedullary linear tract in the spinal cord at the thoracic vertebrae  12-13 region, which appeared hyperintense on T2-weighted images, but was hypointense and  isointense on T1-weighted images when compared with normal parenchyma of the spinal  cord. A hemilaminectomy was performed and a blob of what appeared to be fibrous tissue  was found adhering to the surface of the  dura mater. The diameter of the blob was about  4 mm. A durotomy was performed over the affected area and chondroid material was found  within the spinal cord. Material from the nucleus pulposus penetrated the dura mater from  the ventral aspect of the spinal cord in previously reported intramedullary intervertebral disc  herniation cases, but, in this case, penetration occurred from the left ventrolateral aspect and  progressed through to the right lateral aspect, forming a visible blob of what appeared to be  fibrous tissue on the surface of the dura mater at the exit point. To the best of our knowledge,  this was the first case report of an intramedullary intervertebral disc herniation originating  from the ventrolateral aspect of the spinal cord in a dog.
authors: Department of Veterinary Medicine, Nihon University College of Bioresource Sciences, Japan. kitagawa@brs.nihon-u.ac.jp
authors: Masato
authors: M
authors: Kitagawa
authors: Midori
authors: M
authors: Okada
authors: Kiichi
authors: K
authors: Kanayama
authors: Takeo
authors: T
authors: Sakai
mesh_terms: D000818:Animals; D004283:Dog Diseases / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D004285:Dogs; D055959:Intervertebral Disc Degeneration / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D008297:Male; D011859:Radiography