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乙状窦位置前移(简称前置)较少见,我科1974～1986年底共行中耳乳突手术869例,术中暴露乙状窦壁者70例,现将其中典型乙状窦前置4例报告如下。病历摘要例1,男,15岁。右耳反复发作流脓12年,伴重听。体检:右耳松弛部穿孔,有肉芽及脱落上皮。X 线片报告为Ⅲ型中耳炎。于全麻下耳内切口上鼓室凿开行乳突根治术,清除中耳乳突腔胆脂瘤后,距外耳道后壁0.6cm 处暴露完整乙状窦前壁0.2cm,手术顺利。例2,女,34岁。右耳反复流脓15年,近1月为持续性流臭脓,重听加剧,清除耳内分泌物后见深部充满肉芽。X 线摄片示Ⅲ型中耳炎。于局麻下行耳内切口乳突根治术,凿开筛状区骨皮质深0.2cm 见蓝色软
Sigmoid sinus position forward (referred to as the front) is rare, our department at the end of 1974 to 1986, 869 cases of common middle ear mastoidectomy surgery, surgery to expose sigmoid sinus wall in 70 cases, now the typical sigmoid sinus Set 4 cases reported as follows. Case history summary 1, male, 15 years old. Right ear repeated episodes of pus for 12 years, with heavy listening. Physical examination: perforation of the right ear laxity, granulation and shedding epithelium. X-ray was reported as type otitis media. Under general anesthesia, the incision on the tympanic cavity of the tympanic cavity was performed with radical mastoidectomy. After removal of the central cholesteatoma, the anterior wall of the sigmoid sinus was exposed at a distance of 0.6 cm from the posterior wall of the external auditory canal, and the operation was successful. Example 2, female, 34 years old. Repeated empyema in the right ear for 15 years, nearly 1 month continuous flow of pus, exacerbation, removal of ear secretions see the deep full of granulation. X-ray showed type otitis media. In local anesthesia under ear incision mastoidectomy, screened the sieve area cortical deep 0.2cm see the blue soft