Figure 2.

Cross section of acute appendiceal diverticulitis (A) in the present case and acute suppurative appendicitis (B) in another case. Layer structure (A: arrowheads) was found in appendiceal diverticulitis because of all inflamed layers, and inside echogenic (A: arrow) which means containing air. Multiple lateral hypoechoic projections (= diverticula) were observed. In comparison, an echogenic ring (B: arrowheads) was observed in acute appendicitis showing mucosal and submucosal inflammation, and an echo free space filled with inflammatory fluid inside it.