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Figure 5. Comparison between(a) faecal-impacted appendix and (b) acute appendicitis. Longitudinal ultrasonography image shows the heterogeneous echogenic feacal material impacted in the appendix and well-delineated hypoechoic inner mucosal layer (arrows). Longitudinal ultrasonography image shows the inner hypochoic mucosal layer, which is indistinguishable from hypoechoic intraluminal pus. A focally disrupted echogenic submucosal layer (short arrows) and echogenic inflamed peri-appendiceal fat infiltration (long arrows) are also noted.
