1. There is one cavea on either side of the nose, which is called "maxillary sinus".
   在鼻腔的两侧各有1个空腔,称为"上颌窦"。
2. ObjectiveTo discuss the CT manifestation and clinical significance of rare neoplasm in maxillary sinus, includingmalignant myoepithelioma, angioendothelioma, sarcoma of plasmacyte.
   目的探讨上颌窦恶性肌上皮瘤、血管内皮瘤及浆细胞肉瘤的CT表现及临床意义。
3. 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。

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