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Figure 3. A 4-year-old boy presenting with acute gastroenteritis and mesenteric lymphadenopathy. (a) Heterogeneous faecal material is noted in the appendix. The outer transverse diameter of the appendix is 6.7 mm. The normal wall layers of the appendix are preserved, including a thick hypoechoic mucosal layer (long arrows); no peri-appendiceal fat infiltration is seen, but scanty free fluid is seen in the peri-appendiceal area (short arrow). (b) Another 5-year-old boy with a faecal-impacted appendix; no demonstrably increased blood flow in the appendiceal wall is seen on colour Doppler study.
