The tumor was covered by a layer of thin bone and an aberrant tooth was found near nature orifice of maxillary sinus.The bony erosion of maxillary bone was also noted.

• 术中可见肿瘤外围被覆一层骨质薄膜，且上颌骨部份已被侵蚀破坏，而于上颌窦近开口处有一迷生齿。