title: Imaging diagnosis--Vertebral canal porcupine quill with presumptive secondary arachnoid diverticulum.
abstract: A 3-year-old Gordon Setter developed cervical hyperesthesia and a stiff gait. Upon magnetic resonance (MR) imaging, an arachnoid diverticulum was detected at the C1 level. Upon surgical resection, a porcupine quill was identified within the vertebral canal in the area of the cyst. At a retrospective review of the MR images, the quill appeared as a circular well-demarcated T2-hypointense lesion. Porcupine quill migrations are common in the dog but migration into the central nervous system is rare.
authors.affiliation: Veterinary Teaching Hospital at Washington State University, College of Veterinary Medicine, P.O. Box 647010, Pullman WA 99164-7010, USA.
authors.forename: Adam R
authors.initials: AR
authors.lastname: Schneider
authors.forename: Annie V
authors.initials: AV
authors.lastname: Chen
authors.forename: Russell L
authors.initials: RL
authors.lastname: Tucker
mesh_terms: D000818:Animals; D016080:Arachnoid Cysts / Q000175:diagnosis / Q000209:etiology / Q000601:surgery / Q000662:veterinary*; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging; D019299:Decompression, Surgical / Q000662:veterinary; D004283:Dog Diseases / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D004285:Dogs; D005548:Foreign-Body Migration / Q000150:complications / Q000175:diagnosis / Q000662:veterinary*; D007796:Laminectomy / Q000662:veterinary; D008279:Magnetic Resonance Imaging / Q000662:veterinary*; D046328:Porcupines; D011859:Radiography