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These rarely represent free fluid and are more likely small intestine (intraabdominal) or the great vessels (retroperitoneal). Color flow Doppler is rarely needed to differentiate between these anatomical structures and free fluid, but may be used if in B‐mode the determination cannot be made using combinations of longitudinal and transverse orientations and observing for vessel pulsation (see Figure 6.22).

Pearl: Remember classic positives at the SR view are anechoic (black) triangles, not linear stripes.