问题 单项选择题 A1/A2型题

前列腺癌向外侵犯和转移的MRI影像特征,错误的是()。

A.被膜连续性中断或局部病变组织外突均提示被膜已破坏

B.直肠前列腺间隙消失,前列腺周围脂肪内出现低信号影

C.前列腺周围的神经血管丛发生移位且信号发生改变

D.精囊受侵时,受累侧精囊增大并T2WI上信号减低

E.盆腔及其他部位淋巴结的增大,但是其他器官和(或)骨转移不能显示

答案

参考答案:E

解析:MRI检查是确定前列腺癌的最佳影像检查方法,前列腺被膜有无破坏对临床是否采取手术治疗和估价预后非常重要。正常前列腺被膜应是光滑连续的,一旦被膜连续性中断或局部病变组织外突均提示被膜已破坏。病变延伸至被膜外的其他表现还有直肠前列腺间隙消失,前列腺周围脂肪内出现低信号影,前列腺周围的神终血管从发生移位且信号发生改变。精囊受累时,受累侧精囊增大并T2WI信号减低。MRI还可发现转移所致的盆腔及其他部位淋巴结的增大,也易于发现其他器官和(或)骨转移。

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       Started in 1636, Harvard University (哈佛大学) is the oldest of all the colleges and universities in

the United States. Yale Princeton, Columbia and Dartmouth were opened soon after Harvard.

       In the early years, these schools were nearly the same. Only young men went to college. All the

students studied the same subjects, and everyone learned Latin and Greek. Little was known about

science. And few people know that one kind of school could teach everything that was known about

the world. When the students graduated, most of them became ministers or teachers.

       In 1782, Harvard started a medical school for young men who wanted to become doctors. Later,

lawyers could study in Harvard's law school. In 1825, besides(除……之外)Latin and Greek, Harvard

began to teach modern languages, such as French and German. Soon it began to teach American history.

      As knowledge increased, Harvard and other colleges began to teach many new subjects. Students

were allowed to choose the subjects that interested them. 

      Today, there are many different kinds of colleges and universities. Most of them are made up of

smaller schools that deal with special fields of learning. There's so much to learn that one kind of school

can't offer all.

1. Is Harvard the oldest university in the US?

    ______________________________________________________

2. Who went to college in the early years?

    ______________________________________________________

3. How many languages did Harvard teach in 1825?

    ______________________________________________________

4. Why did Harvard and other colleges begin to teach many new subjects?

    ______________________________________________________

5. Why are most of colleges and universities made up of smaller schools today?

    ______________________________________________________

单项选择题