Page 313 - Atlas of Small Animal CT and MRI

Traumatic and Vascular Disorders 303

Figure 3.2.8 Cervical Vertebral Subluxation with Articular Facet Fracture (Canine) CT & MR

(a) DX, LAT (b) CT, SP (c) CT, TP

(d) CT, 3D, DORS (e) CT, 3D, RLAT (f) CT, 3D, LLAT

(g) T1+C, TP (h) T2, TP (i) T2, SP
5y F Terrier cross bitten in the cervical region by a larger dog earlier in the day. Currently has neurologic deficits neuroanatomically
localized to C6–T2. Survey radiographs reveal dorsal subluxation of C7 relative to C6 and narrowing of the C6–7 intervertebral disk
space (a: arrowhead). Similar findings are also seen on sagittal and 3D reformatted CT images (b,f: arrowhead). In addition, there is a
highly comminuted and displaced fracture of the right cranial articular process of C7 (c–e: arrow). The left articular process is normal
by comparison (f: arrow). On MR images, the C6–7 intervertebral disk space is reduced in width and T2 signal intensity (i: arrow), and
extruded disk material is present in the right ventral vertebral canal (g,h: arrowhead). There is evidence of spinal cord compression (g–i)
and spinal cord T2 hyperintensity at the level of C6–7 (h,i), indicative of an intrinsic component to the injury. Disk material was removed
from the canal, and the subluxation was reduced and stabilized surgically.

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