【例１】　男，４５岁。因左眼球突出伴视力丧失６个月入院。查体：左眼球明显突出，眼睑不能闭合，眼球活动轻度受限，视力仅手动／眼前，鼻腔检查未发现明显肿物。鼻窦ＣＴ示左侧筛窦区内３ｃｍ×３ｃｍ密度均匀的肿物，四周骨壁已破坏。初诊为筛窦恶性肿瘤。局部放疗后行鼻 [Example 1] Male, 45 years old. Due to the left eyeball protruding with vision loss for 6 months admitted to hospital. Physical examination: The left eyeball was prominent, the eyelids could not be closed, the eyeball activity was mildly limited, the visual acuity was only manual/in front of the eye, and no obvious tumor was found on the nasal cavity. The sinus CT showed a 3cm×3cm uniform density mass in the left ethmoidal sinus, and the surrounding bone wall was destroyed. The newly diagnosed ethmoid sinus cancer. Localized radiotherapy