Page 670 - Atlas of Small Animal CT and MRI

660 Atlas of Small Animal CT and MRI

Figure 6.3.7 Abscess and Osteomyelitis (Canine) CT

(a) DX, VD (b) CT, TP (c) CT+C, TP

(d) CT, 3D, VENT (e) CT, SP (f) CT+C, SP
3y FS Mastiff with a failed total hip implant that was recently removed. A radiograph and a 3D rendering of the right coxofemoral region
reveals bone architectural change of the right proximal femur and acetabular remnant associated with previous total hip replacement
(a,d). Altered bone margins are smooth but irregular, and bone density is heterogeneous. A small quantity of methyl methacrylate is
present adjacent to the medial cortex of the right ilium. CT images show an irregularly shaped fluid and soft‐tissue attenuating mass
interposed between the proximal femur and acetabular remnant (b,e: arrowheads). Following intravenous contrast administration, the
mass is clearly defined as a thick‐walled abscess (c,f: arrowheads). The bone remodeling of the proximal femur and acetabular remnant
is also indicative of concurrent osteomyelitis. The implant site was surgically drained and debrided. Bacterial culture of the abscess fluid
was positive for Enterobacter sp. Biopsy of the proximal femur confirmed a diagnosis of osteomyelitis.

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