Advanced age, high BMI, atypical appendix location, and complicated appendicitis are associated with inconclusive ultrasound and the need for further CT to diagnose acute appendicitis.

Performing CEUS on patients presenting with US findings of acute cholecystitis is relevant, since the presence of a discontinuous or irregular enhancement of the GB wall appears to be correlated with the diagnosis of gangrenous acute cholecystitis.

CT extravasation of contrast material in IP and RS hematoma does not appear to be related with clinical criteria of severity, and therefore should not be solely considered as a radiological decision criteria.

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