Computed tomographic (CT) liver volumetry using the slice addition technique is an accurate, but a time‐consuming method. Commonly used DICOM‐viewing software only allows contouring of one area per image, which can be troublesome in the transverse plane as different lobes are separated. In this prospective, experimental, methods comparison study, we aimed to determine if hepatic contouring using sagittal reformatting and a reduced number of images would yield accurate results. Computed tomographic studies were performed in five canine cadavers and reviewed using sagittal reformatting. For each dog, the number of images that included the liver was used to create four stacks with progressively fewer images in which the liver would be contoured, each with the following median number of images: A: 60, B: 31, C: 16, and D: 9. Liver volume was calculated by three observers using the different stacks of images. After CT examination, the cadavers were dissected, the liver was removed, and its volume was determined by water displacement. Single score intraclass correlation coefficient was calculated to assess interobserver agreement. Kruskal‐Wallis test was used to compare water displacement and CT‐based volumes. There was excellent agreement between observers (intraclass correlation coefficient = 0.957; 95% confidence interval, 0.908‐0.982, P < 0.0001). No significant difference was found between the volumes obtained by CT‐volumetry using each of the stacks and the volumes obtained by water displacement. Using sagittally reformatted images and hepatic contouring in as few as nine images can be an accurate and simple method for CT‐volumetry of the canine liver.
The present report describes the clinical, gross pathologic and radiologic features of vertebral osteomyelitis in a black spiny-tailed iguana (Ctenosaura similis) and a red tegu (Salvator refuscens). Both lizards were presented with hind limb ataxia and proprioception deficits and based on radiographic and computed tomographic imaging, a presumptive diagnosis of vertebral osteomyelitis was made. Microbiological examination of vertebral body biopsies revealed Morganella morganii and Enterococcus faecalis infection in the iguana and Enterobacter cloacae infection in the tegu. Failure of antimicrobial treatment in both lizards was considered to be at least partly attributable to the tardy onset of clinical signs resulting in a late diagnosis and pronounced chronicity of the vertebral lesions. While vertebral osteomyelitis has been repeatedly reported in snakes, reports in saurian species are scarce and rather anecdotal. Based on the findings in these cases, however, vertebral osteomyelitis should be considered as an important differential diagnosis for hind limb ataxia in lizards.
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