骨瘤是鼻窦最常见的良性肿瘤，在常规鼻窦Ｘ线片中占１％。最多见于额窦，在筛窦、上颌窦中少见，罕见于蝶窦。有关骨瘤的病因学目前尚不清楚，对其起源及发展存在三种假说，骨瘤有两种不同的病理类型：象牙骨瘤及海绵状骨瘤。通常骨瘤为局限性病变，生长缓慢，甚至无变化。虽 Osteoma is the most common benign tumor of the sinuses, accounting for 1% of conventional sinus radiographs. Most seen in the frontal sinus, in the ethmoid, maxillary sinus rare, rare in the sphenoid sinus. The etiology of osteoma is unclear, and there are three hypotheses about its origin and development. There are two different types of osteoma: ileocecal osteoma and cavernous osteoma. Osteoma is usually a localized lesion, growing slowly, even without change. although