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

结论该术式治疗输段梗阻创伤小、操作精确、效果确切、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，进一步的上颌窦扩大术提供便利。