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局限性迷路炎(Circumscribed labyrinthitis)又称迷路瘘管,多因胆脂瘤型中耳炎破坏迷路骨质引起。有时骨疡型中耳炎亦能引起,尤其迷路周围气房丰富者骨迷路容易被破坏形成瘘管,偶见由手术外伤损伤迷路骨质引起。瘘孔多位于外半规管,少见于鼓岬部,位于其它半规管者更少见。瘘管可仅穿破迷路骨质而骨内膜保持完整,此时瘘孔不和外淋巴管腔相通。由于内膜的隔离使炎症限于迷路骨质。当骨内膜被穿破后瘘管始与外淋巴腔相通,但膜迷路通常无炎症改变,瘘管可由胆脂瘤膜、肉芽或结缔组织等所封闭使炎症局限于骨迷路内。因耳蜗处之外淋巴腔间隙较宽大类症易于扩散,所以该处的瘘管转为弥漫性迷路炎的机会较多。少数瘘管可因新骨形成而自行愈合。
Limitations Lost inflammation (Circumscribed labyrinthitis), also known as lost fistula, mostly due to cholesteatitis otitis media destruction of the lost bone caused. Sometimes bone ulcer otitis media can cause, in particular, get lost around the rich air trapped bones easily lead to the formation of fistula, and occasionally caused by surgical trauma injury lost bone. Fistula hole and more in the outer semicircular canal, rare in the promontory promontory, located in other semi-regulatory less common. Fistula can only wear broken bones and endosteum remains intact, this time fistula hole and the lymphatic lumen interlinked. Inflammation is confined to the lost bone due to the isolation of the intima. When the endocervix is punctured, the fistula begins to communicate with the perilymph but the labyrinth of the membrane usually has no inflammatory changes. The fistula can be closed by the cholesteatoma membrane, granulation tissue or connective tissue, which limits the inflammation in the bony labyrinth. Due to a wide range of lymphatic spaces outside the cochlear lymphadenopathy is easy to spread, so the Department of fistula diffuse vaginal discharge opportunities are more. A small number of fistulas can be healed by new bone formation.