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Sonographic distinction between acute suppurative appendicitis and viral appendiceal lymphoid hyperplasia ("pink appendix") with pathological correlation.

The viral etiology of mesenteric lymphadenitis may also affect the lymphoid tissue of the appendix in children giving rise to symptomatic appendiceal lymphoid hyperplasia, the so-called "pink appendix." The present study used ultrasound (US) to determine if certain sonographic features correlated with appendiceal pathological findings. Our results indicate that a fluid-filled appendix always correlates with a suppurative or mixed pathological appearance that likely merits surgery. A lymphoid predominant pathological appearance occurred only in cases where appendiceal wall thickening alone was seen on US. This pilot project therefore shows that US has the potential to stratify acute appendix patients into different treatment regimens, given that lymphoid hyperplasia could be treated conservatively. Further studies correlating other clinicoradiological parameters with this sonographic appearance are warranted.

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