![]() ![]() The term silhouette sign (or border effacement) is used to describe the effacement of the borders of two touching structures of the same radiographic opacity. For example, the caudal pole of the right kidney often overlaps the cranial pole of the left kidney, the area of overlap yielding an increase in soft tissue opacity relative to the nonoverlapping portions. The term summation refers to the two-dimensional (2D) additive effects of three-dimensional (3D) structures, such as the organs within the abdomen. Recall that the five basic radiographic opacities, in increasing order, are air, fat, soft tissue, bone, and metal. The basic principles of radiographic interpretation include size, shape, location, number, margination, and opacity of structures imaged. This chapter will focus on the important unique radiographic features of puppies and kittens, application of radiographic principles, and interpretation advice specific diseases are left to the appropriate dedicated chapters. Use of the basic principles of radiographic interpretation is essential, and doing so at least in part alleviates the uncertainties invariably encountered. Interpretation of radiographic images can be an even greater challenge, primarily because of unfamiliarity with the immature, developing skeletal system. Radiography of kittens and puppies is technically demanding because of the small patient size. ![]()
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