Page 319 - Atlas of Small Animal CT and MRI

Traumatic and Vascular Disorders 309

Figure 3.2.15 Sacral Fracture and Sacroiliac Luxation (Canine) CT

(a) CT, TP (b) CT, TP (c) CT, TP
4y FS Terrier struck by an automobile 1 day previously. The dog currently has left pelvic limb plegia and no deep pain perception,
indicative of left sciatic neuropathy. CT images of the sacrum and sacroiliac joints are ordered from cranial to caudal. There is a
comminuted fracture of the sacrum with displacement of major fragments (a–c). The fracture disrupts the ventral margin of the
vertebral canal (a,b: large arrowhead), and fracture fissures also involve the dorsal and pelvic sacral foramina (a–c: small arrow-
heads). A mildly displaced left sacroiliac luxation is also evident (a–c: arrow). Additional fractures involving the ischia and pubis
are not shown. Injuries were managed medically because of the degree of sacral fracture comminution. The dog partially recovered
left sacral nerve function.

Figure 3.2.16 Sacroiliac Luxation (Feline) CT
8y FS Domestic Shorthair bitten by a dog
48 hours previously. Neurologic deficits were
anatomically localized to T3–L3 as the result
of an L1 vertebral fracture not shown here.
There is ventral luxation of the left sacroiliac
joint (a,b: arrows) associated with a small
fracture fragment (a: arrowhead). A maximum‐
intensity projection reveals cranial displace-
ment of the left ilium and fractures of the right
pubis and ischium (b: arrowheads).

(a) CT, TP (b) CT, MIP, VENT

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