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This artifact occurs where there is a curve within a fluid‐filled structure and is especially associated with the urinary bladder and gallbladder mimicking sediment and a mass. To differentiate artifact from sediment, consider where the gravity‐dependent region is within the lumen of these structures. If “sediment” appears in nongravity‐dependent regions, you should consider the possibility of artifact. Other techniques to differentiate artifact from true pathology include eliminating the artifact by turning down the gain and ballottement or changing the patient’s position. Finally, some hasty sonographers will misinterpret an artifact for a mass. Simply place color flow Doppler on the suspect region for differentiation because a mass generally has pulsatile blood flow and an artifact (and thrombus) does not. See Chapter 3 for more explanation and examples.