Ultrasound findings of acute appendicitis

Ultrasound findings of acute appendicitis

The appendix appears as a round target with an anechoic lumen, surrounded by a hypoechoic and thickened (greater than 2 mm) appendiceal wall.

This finding with reproduction of pain under the transducer has a diagnostic accuracy of 95% and a negative predictive value of 97%.

Although US evaluation for appendicitis has the advantage of bedside portability and lack of radiation, CT has been shown to have superior sensitivity, accuracy, and negative predictive value (96% versus 76%, 94% versus 83%, and 94% versus 76%, respectively).


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