The remaining three patients underwent operations within 4 ? 20 days after ct examinations because at first they were making good progress with conservative treatment by means of nasogastric or long intestinal tube decompression , but their symptoms became aggravated little by little 其余的3例病人在ct检查4 ? 20天后才进行手术，是由于起初经鼻胃管或肠管减压保守治疗效果较好，但后来症状渐渐恶化。
Sometimes the excretion of larvae is 3 or 4 times the length of their bodies . this is known as the " excretion - dragging phase " , because the excrement is drawn along behind the protozoeal shrimp in long strands . when the larvae have eaten , they fill their intestines exhibiting a yellowish green color spirulina and skeletonema costatum , or white color oyster eggs 眼幼虫期之摄饵情形可由幼虫是否托著长条状之粪便判别，有时托上其体长3 4倍长之粪便，故又称为拖粪期，饱食后其肠管内呈黄绿色螺旋藻矽藻类，或白色牡蛎卵。
