NAVLE（北美执业兽医考题）Day 511

A nine-year-old German Shepherd presents with a severe abdominal pain and in shock.After starting fluid therapy, a lateral abdominal radiograph is made.The dog is taken to surgery and laparotomy reveals what is seen in the second image below.Which one of the following choices is the most likely diagnosis?

一只9岁的德国牧羊犬出现严重的腹痛和休克。在开始输液疗法后，拍摄腹部侧位X光片。狗被进行剖腹探查，看到了第二张图片中的东西。以下哪种选择最可能是诊断？