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KMID : 1094020150320010069
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Journal of Veterinary Clinics
2015 Volume.32 No. 1 p.69 ~ p.72
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Differentiation of Canine Calcium Oxalate and Canine Struvite Stones using Computed Tomography
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Yoon Young-Min
Lee Hee-Chun
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Abstract
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This study was performed to differentiate calcium oxalate and struvite canine urinary stones using computedtomography. A total of 38 urinary stones (8 calcium oxalate and 30 struvite) were scanned using a computed tomographyscanner. These urinary stones (10-15 mm diameter) extracted surgically without fragmentation were obtained from thedifferent individual patients. The stone’s Hounsfield units(HU) values, heterogenicity, and roughness of surface wereevaluated to differentiate calcium oxalate and struvite. The HU values of calcium oxalate were significantly higherthan those of struvite. A receiver operator characteristic (ROC) curve revealed 1272 as the best threshold value todistinguish calcium oxalate from struvite (ROC curve AUC 0.87, p < 0.0014). The heterogenicity of calcium oxalateand struvite significantly differed on bone and dental window setting (p < 0.0001). There was no significant differencebetween calcium oxalate and struvite in roughness of surface. On computed tomographic images, bone and dentalwindows setting were useful for evaluation of heterogenicity between calcium oxalate and struvite. The HU valueand heterogenicity are highly promising factor that can distinguish calcium oxalate and struvite with reasonable accuracy.
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KEYWORD
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urinary stone, calcium oxalate, struvite, computed tomography
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