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The classic CC positive view with a small‐volume effusion has a small anechoic (black) triangle in the “CC pouch,” between the urinary bladder apex and the body wall in the most gravity‐dependent region (see Figure 6.25). Large‐volume positives are usually easy to see in real time with the wafting movement of small intestines and omentum. Urinary bladder pathology such as sediment and calculi is most commonly going to be in the same most gravity‐dependent view of the “CC pouch.” When a mass effect is found in the urinary bladder, the best way to differentiate a thrombus from a mass is by using color flow Doppler, with a thrombus (and artifact) with no flow versus a mass with pulsatile blood flow.

Pearl: When a urinary bladder mass is found, differentiate through the use of color flow Doppler, with a thrombus having no flow versus a mass that will have pulsatile blood flow.