Methods:Based on the sites of the tumors, following approaches were adopted:(1)the anterior maxillary sinus wall disassemble approach;

方法：根据肿瘤位置不同，分别采用（1）上颌窦前壁拆装；

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Methods:Based on the sites of the tumors, following approaches were adopted:(1)the anterior maxillary sinus wall disassemble approach;

方法：根据肿瘤位置不同，分别采用（1）上颌窦前壁拆装；

youdao