Page 298 - Atlas of Small Animal CT and MRI

288 Atlas of Small Animal CT and MRI

Figure 3.1.7 Cervical Spondylomyelopathy (Canine) CT

(a) CT+C, TP (b) CT+C, TP (c) CT+C, TP
3y MC Mastiff with hypermetria in all limbs. CT myelographic images a, b, and c are at the approximate level of the C2–3, C3–4, and C4–5
intervertebral disk spaces, respectively. Hyperattenuating new bone of the lamina (a–c: arrow) and articular facets (a–c: arrowheads) at
all three levels results in reduction of vertebral canal cross‐sectional area and change in shape, with greatest narrowing occurring in the
horizontal axis. Remodeled articular facet margins impinge on the spinal cord to the greatest extent at C4–5, although a thin subarachnoid
contrast column is retained (c). Additional sites with similar abnormalities were present more caudally (not shown).

Figure 3.1.8 Cervical Spondylomyelopathy (Canine) CT
3y MC Labrador Retriever with myelopathy neuroanatomically localized to C1–5. The CT
myelographic image is at the level of C4–5. Hyperattenuating new bone of the lamina (black
arrow) and articular facets (arrowheads) results in reduction of vertebral canal cross‐sectional
area and change in shape, with greatest narrowing occurring in the horizontal axis. The spinal
cord is grossly distorted by bilateral compression from hypertrophied articular facets. There is
also a separate osseous fragment associated with the distal margin of the right caudal aspect
of the fourth cervical articular facet (white arrow), consistent with osteochondrosis.

(a) CT+C, TP

288