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Commonly in cats and less so in small dogs, both kidneys are imaged in the same field of view at the SR view. This is unlikely to be a mirror image artifact, which requires a strong air–soft tissue interface (Figure 6.22) (see Chapter 39).

Figure 6.22. Pitfalls at the SR view and linear stripes are not free fluid. In (A) and (B) are similar images with color flow Doppler showing the great vessels (CVC and abdominal aorta) that are clearly linear and anechoic in B‐mode in (B). In (C) it is difficult to tell if the anechoic (hypoechoic) linear stripe is great vessels or small intestine; however, when fanning as a general rule, a great vessel will be an anechoic tube with pulsation and the small intestine will have sonographically layered linear stripes as in (D). The author refers to small intestinal wall layering in transverse orientation as appearing like “hamburgers” (oval with a line through its center) and in longitudinal (sagittal) orientation as “highways” (median stripe and two shoulders of the road). Note both planes of orientation are in the image.

Source: Reproduced with permission of Dr Gregory Lisciandro, Hill Country Veterinary Specialists and FASTVet.com, Spicewood, TX.