Conclusions Ureteral meatotomy is safe and effective in treating obstruction of the uretero-vesical junction.

结论该术式治疗输尿管壁段梗阻创伤小、操作精确、效果确切、简单易行。

The uncinate fragment is then grasped and removed as one piece.This should bring into view the opening of the maxillary sinus and facilitate subsequent maxillary sinus meatotomy.

这时可以看到上颌窦的开口，并为进一步的上颌窦口扩大术提供便利。