血中FT3，FT4和TSH均升高时应检测（）
A.甲状腺核素显象
B.TSH受体抗体
C.甲状腺131I摄取率
D.头颅MRI
E.甲状腺B超
参考答案：D
解析：FT3、FT4和TSH同时升高表明体检者患上了垂体性甲亢。垂体性甲亢是指促甲状腺激素分泌过多引起的甲亢，多数由于垂体瘤引起，少数由下丘脑一垂体功能紊乱导致。因此此时应做头颅MRI检查垂体状况。
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