题目内容
关于直肠癌的B1分期，正确的是
2022-03-14
A.癌肿穿透肌层而无淋巴结转移
B.侵人肌层而无淋巴结转移
C.癌肿在肠壁内但淋巴结有转移
D.癌肿已穿透肠壁，淋巴结有转移
E.癌肿仅局限于黏膜
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