Hansen type I disk disease at T1-2 in a Dachshund

A 7-year-old Dachshund was presented with chronic left thoracic limb lamene ss and acute neurological deficits to the hind limbs following trauma. A le sion was suspected between C7 and T2 on the basis of neurological examinati ons. Radiography and myelography identified a calcified intervertebral disk at C7-T1 and an extradural unilateral compressive lesion at T1-2. Computed tomography scans of the cranial thoracic spine revealed extrusion of disk material from the T1-2 intervertebral space resulting in marked spinal cord compression. Intervertebral disk disease is rarely reported at this locati on. The neurological condition deteriorated after a second myelogram, which was done to examine the thoracolumbar spine. A modified dorsal decompressi on of T1-2 was performed. The dog was euthanased due to further neurologica l deterioration 8 days after surgery.