Among 402 patients with acute appendicitis studied, 7.5% failed to be diagnosed by routine pre-surgery physical examination: 4.0% were definitely diagnosed later by using ultrasonography and 3.5% were not diagnosed until abdominal incision.

• 本组资料显示，用常规检查术前未明确诊断急性阑尾炎的占7.；5%25，通过超声波检查又确诊4