左心室增大在后前位X线片上，不正确的表现包括（）.
A.左心室段延长
B.心尖向下向左延伸，居膈下甚至在胃泡内
C.左心缘圆隆，有时上部隆起明显，使心脏呈球形
D.心腰膨隆
E.增大显著时将心影向左推并膨隆，也可推压左心房向外后上方
参考答案：D, E
解析：左心室增大使心脏逆钟向旋转，随之出现的间接征象为主动脉结凸出，心腰凹陷。左室肥厚常以短径增大为主，因而可近似球形；左室扩大时心尖向左下延伸，常低于右心膈角一个肋间以上。增大显著时将心影向右推并膨隆，也可推压左心房向外后上方。
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| My husband and I sat outside. A small child about three came up the street, accompanied by her mother. As she saw another girl a few feet away, she gave her admiring comment, "Mommy, I like her dress." Her mom 1 , "Well, why don't you go and tell her?" The little girl walked 2 toward the girl wearing the pretty dress. The other one, 3 the same age, was standing with her 4 turned, alongside her parents. They had not heard the compliment (赞美). Receiving no answer, this little one 5 . My husband said to the other girl, " 6 wants to tell you something." As she turned around, connection was made. Once again, the little one 7 "I like your dress," and upon hearing those words, the other one gave her a big smile and excitedly 8 "Look, it's a spinning (旋转) dress!", at which moment she began to spin in 9 . Both of them smiled widely. Now, the one stopped spinning and said, "It's my favorite dress and I have (a) 10 that match!" She 11 running toward a stroller (婴儿车) parked nearby. The mom and the daughter started to 12 down the street, 13 the encounter (邂逅) had ended. Moments later, the "spinning dress girl" reappeared, shoes in hand, 14 her new friend who had seemingly disappeared. Now, an elderly couple, seated on a bench, had obviously been 15 of all this. The man 16 the child, saying, "There's someone coming behind you." Then we saw one showed and the other 17 the beautiful shoes. If you can make a 18 better, do it. I have no idea how many others that evening might have 19 this act, hoping to help good things to happen. But such brief moments, 20 together, make up what might very well be the important times in our lives.
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