题目内容
实性肿瘤声像图特征，下列哪项是错误的（ ）
2021-10-14
A.边界回声可光滑、整齐或不规则
B.外形常呈圆形、椭圆形或不规则
C.内部回声不均匀
D.后方回声均有衰减
E.侧方声影可有可无
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