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食管癌的诊断中常用的辅助检查有哪些

答案

参考答案:答:食管癌的诊断中常用的辅助检查主要有: (1)X线钡餐造影:常见的征象有病变段食管管腔狭窄、管壁僵硬、充盈缺损、黏膜紊乱、溃疡龛影等,可以指示食管病变位置、梗阻程度以及胃排空功能等重要信息。 (2)食管脱落细胞学检查:通过拉网行食管脱落细胞学检查简单方便,受检者痛苦小,假阳性率低,在高发区进行大面积普查时最切实可行。 (3)内镜检查:此检查直观可靠,可直接观察病变,准确进行定位,同时还可以对病变进行活检,对病变的定性有重要意义。 (4)胸部CT:可对食管癌的分期、病变切除可能性的判断等均有帮助。 (5)食管超声内镜:此技术在测定病变的浸润深度,判断异常淋巴结等有优势,但也有不足之处。 (6)正电子发射断层扫描(PET):此检查有助于病变的定性,同时对于发现早期微小转移等有较高的敏感性和特异性。

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Napoga is a 12-year-old girl in Ghana, Africa. It is hard for her family to get clean water. Every morning, she leaves home at half past five to get clean water for her family in a village far away. It takes her six hours to get enough clean water for daily cooking and drinking. She has no time to go to school or to play with her friends. Millions of people in the world are like Napoga. They can’t get enough clean water to keep healthy.

Earth Day is April 22. But on all other days, we must also remember it. The water we use is the most important natural resource on the earth.

Water covers 70% of the earth’s surface. But most of that is sea water. We can’t use it for very many things. Fresh water covers only 1% of the earth’s surface. You probably feel lucky that your life isn’t as hard as Napoga’s. But that doesn’t mean you don’t have to worry about water. We all face serious water problems. One of them is water pollution. All kinds of things from cars, factories, farms and homes make our rivers, lakes, and oceans dirty. Polluted water is very bad for people to drink. And dirty water is bad for fish, too. Now, 34% of all kinds of fish are dying out. How do cars and factories make our water dirty? First, they pollute the air. Then, when it rains, the rain water comes down and makes our drinking water dirty. Dirty rain called acid rain(酸雨), is also bad for plants, animals and buildings. Something must be done to prevent water form be­ing polluted.

Scientists say that in 30 years, more than half of the people in the world won’t have enough clean water. We have to learn how to save more water for ourselves and our children. Here is some advice for saving water:

●Turn off the water while you brush your teeth. You can save as much as 450 liters(升) each month.

●Leaky taps(漏水的龙头) waste a lot of water. Fix them right away!

●You can easily cut your 10-minute showers in half—and you’ll be just as clean.

●When you wash dishes, don’t let the water run.

●Only wash clothes when you have a lot to wash. If your washing machine isn’t full, you’re wasting water!