Iranian Veterinary Surgery Association (IVSA) Iranian Journal of Veterinary Surgery 2008-3033 21 1 2026 04 01 Extradural Vertebral Chondrosarcoma in a Poodle-Terrier Dog 75 78 233920 10.30500/ivsa.2025.541732.1460 EN Ahmad Khajeh Mahrooyan Veterinary Clinic, Ahvaz, Iran. Mahan Sarebani Department of Clinical Sciences, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran. Sina Mahmoudabadi Department of Clinical Sciences, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran. 0000-0003-1667-2541 Annahita Rezaie Department of Pathobiology, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran. Mahnush Kamyabnia Department of Clinical Sciences, Faculty of Veterinary Medicine, Shahid Chamran University of Ahvaz, Ahvaz, Iran. Elham Eslahi Department of Clinical Sciences, Faculty of Veterinary Medicine, Islamic Azad University of Shoushtar, Shoushtar, Iran. Journal Article 2025 08 17 This study describes the clinical presentation, magnetic resonance imaging (MRI) features, surgical treatment, and outcome of an unusual extradural vertebral chondrosarcoma in a dog. A 6-year-old neutered male Poodle-Terrier with an extradural chondrosarcoma diagnosed at the level of the T11 vertebra, following surgical excision by dorsal laminectomy. Clinical, radiographic, MRI, histopathologic, and postoperative rehabilitation data were assessed. Following the sudden onset of pelvic limb paralysis in the dog, MRI revealed a lobulated, extradural mass at the T11 vertebra (13 × 7 mm) hyperintense on T2-weighted images, causing compression of the spinal cord. Surgical removal revealed a chondrosarcoma with a soft, pale pink to white gross appearance. Rehabilitation following surgery, including physiotherapy, hydrotherapy, and laser therapy, resulted in weight-bearing recovery within 3 months, while the dog never acquired the ability to stand without support until 9 months despite 80 sessions of physiotherapy. No metastasis was observed after surgery. This case exemplifies the diagnostic utility of MRI for detection of extradural spinal tumors and potential surgical resection for improving quality of life, but long-term prognosis can be reserved due to incomplete functional recovery and local aggressiveness of the tumor. https://www.ivsajournals.com/article_233920_443b4cbf66ccdc00663d65745fe06be8.pdf