The main symptoms at the presentation were abdominal pain(100%),abdominal distension(100%),acute abdomen(100%),vomiting(68.2%,15/22),an fever(36.4%,8/22).

• 主要症状和体征为腹痛、腹胀、腹部膨隆、腹膜刺激征；呕吐68.；2%25(15/22)；发热36