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【单选题】
下列哪项为甲状旁腺腺瘤的声像图特征A.
甲状腺后缘可见单发圆形、椭圆形低回声区，包膜薄而完整
B.
甲状腺后缘可见单发长方形、三角形、不规则形低回声区，包膜薄而完整
C.
内部出现无回声区则为合并出血、坏死或囊变所致
D.
腺瘤前缘和周边可见丰富的血流环绕并进入瘤体内
E.
以上都是
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