下列哪一项与乳腺硬癌无关
A．硬癌为乳腺癌中较常见的一种
B．硬癌体积小，质地坚硬
C．表面凹凸不平，境界不清
D．因硬癌肿瘤细胞数少，纤维细胞多，所以肿瘤内部为强回声
E．肿瘤后方明显衰减
参考答案：D
解析： 乳腺硬癌又称浸润性导管癌，为乳腺癌中较常见的一种。硬癌大多为纤维组织集合形成条索状及片状，表面凹凸不平，体积小，质地坚硬。超声显示肿瘤小而后方明显衰减为其特点，同时也有边界不整、内部回声不均的特点。乳腺硬癌恶性程度高，易发生早期转移。
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