單項選擇題

乳腺癌患者,肺部無轉(zhuǎn)移灶,發(fā)生椎體轉(zhuǎn)移的原因是()

A.直接蔓延
B.轉(zhuǎn)移途徑尚未明確
C.經(jīng)肺血道轉(zhuǎn)移
D.經(jīng)椎旁靜脈血道轉(zhuǎn)移
E.經(jīng)椎旁淋巴道轉(zhuǎn)移

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