有几个原因可以来解释为什么有时候会看不到阑尾，包括盲肠后的位置，正常阑尾，穿孔，和尖端周围发炎。
There are several reasons why the appendix may not be visualized, including retro-cecal location, normal appendix, perforation, and inflammation around the distal tip.
方法：回顾分析23例盲肠后位阑尾炎的超声表现，并与手术病理对照。
Methods: Comparing with pathological results, sonography image of 23 cases with retrocecal appendicitis were retrospectively analyzed.
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