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上皮の前房内侵入に就いてはCollins and Gro-ss (1892)が始めて記載して以来数多くの報告があるが,Perera (1938)はこれを1)虹彩上皮性真球腫,2)前房外傷性乃至上皮性嚢腫,3)前房上皮形成乃至上皮下降増殖の3型に分類した。最近ではTheobald and Haas (1948),Calhoun,(1949),Pincus (1950),Maumenee (1956,1957),Long and Tyner (1957)等の報告がある。
この内epithelial downgrowth (上皮下降増殖)は穿孔性外傷或は手術に引きつづき結膜或いは角膜の重層扁平上皮が創口より前房内へ侵入し,角膜後面を内被細胞に換つて被い,更に前房偶角,虹彩,硝子体前面迄下降増殖し,屡々新生上皮による前房偶角の閉塞或いは随伴する虹彩毛様炎により耐え難い続発緑内障を惹起する予後不良の合併症である。
Two cases of epithelial downgrowth following cataract extraction are presented. The first case is that of a 34 years old woman who had an extracapsular cataract extraction from the left eye with a good visual result. Nine months later she had an attack of congestive glaucomain her operated eye. On slit lamp examination a thin translucent membrane with a fine gray line at its lower border was noted extending down 3mm on the posterior surface of the cornea One month after first being seen a limbal fistula developed at 11 o'clock and caused abnormal low ocular tention.
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