问题 单项选择题 A1/A2型题

下列情况符合小叶原位癌的特点的是()

A.需清扫腋窝淋巴结

B.需进行手术,加用放疗

C.起源于末梢导管和腺泡,未突破基底膜

D.很快发展为浸润癌

E.常发生于中老年妇女

答案

参考答案:C

解析:小叶原位癌起源于终末导管一小叶单元,癌细胞局限于管泡内,未突破基底膜,未发生浸润,不需广泛切除及腋窝淋巴结清扫,也不需放疗。小叶原位癌在诊断时30%为双侧性,本病多见于青年妇女。小叶原位癌发展慢,预后好,从确定诊断到发生浸润,可间隔25年之久,不易发展为浸润癌。

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     Most students want to study well. But what is the best way to study? This is a very important question.
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