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Developmental Disorders 293
Figure 3.1.16 Vascular Anomaly (Canine) CT
(b) CT+C, TP (c) CT+C, TP
(a) DX+C, VD (d) CT+C, TP (e) GP, VENT
3y FS German Shorthair Pointer with a 1‐month history of ataxia and collapsing. A complex tubular contrast‐filling defect is seen within
the cervical subarachnoid space on a conventional myelographic examination (a: arrowheads). A complex of dilated, coiled blood vessels
is seen in the cervical region on a CT myelogram following intravenous contrast administration. Vessels within and external to the verte
bral canal cause spinal cord displacement and compression (b–d: arrowhead). Selective angiography (not shown) revealed absence of
the right subclavian artery, causing redirected arterial flow from the left vertebral artery through the vertebral canal to the right side.
Postmortem examination documented the extent of vascular dilation and impingement on the cervical spinal cord (e: arrows). Westworth
et al 2006. Reproduced with permission from Wiley.
51
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