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Progressive Myelopathy Due to a Spontaneous Intramedullary Hematoma in a Dog: Pre- and Postoperative Clinical and Magnetic Resonance Imaging Follow-up

From the Neurology Unit (Thibaud, Blot), Surgery Unit (Hidalgo), Internal Medicine Unit (Benchekroun), Rehabilitation Unit (Fanchon), Pathology Unit (Crespeau), and the Centre Anticancéreux Vétérinaire (Delisle), National Veterinary School of Alfort, Ecole Nationale Vétérinaire d’Alfort, Service de Neurologie, 7 Avenue du Général de Gaulle, Maisons-Alfort, 94700 France.

A 4-year-old, male Jack Russell terrier was presented for a 6-month history of progressive right hemiparesis with episodic cervical hyperesthesia. The neurological examination showed a right-sided, upper motoneuron syndrome and partial Horner’s syndrome. Two magnetic resonance imaging (MRI) examinations were performed 3 months apart and revealed a persistent cervical intramedullary hematoma. A dorsal myelotomy was performed. A subacute hematoma was confirmed histologically without underlying lesions. Eighteen months later, the dog’s clinical signs were minimal. Two MRI examinations were performed 2 weeks and 5 months after surgery and revealed regressing signal abnormalities at the surgical site, consistent with a surgical scar.