外傷性外耳道閉鎖症並に外耳道眞珠症の1治驗例

　緒言

　本症例は外傷により頬骨弓の骨折を起し，その破片が外耳道前壁を破壞突入して外耳道の閉鎖を來し，その内側の盲嚢内に眞珠腫を形成したものである．文献上にもかゝる成立機轉の外耳道閉鎖は他に例なく，又外耳道眞珠症の成因に関しては從來種々の見解が述べられているが定説なく，本例はこの問題に関しても一つの解明の示唆を與えていると考えられるので茲に報告する．

Ogura reports on a case of cholesteatoma of external aural meatus the origin of which was the affect of trauma. The patient, a girl aged 20, sustained a fracture of zygomatic arch when a piece of the fractured bone pierced through the external meatus. Subsequently, the aural canal was completely occluded by exuberations of granulation tissues, at the site of injury, and by formation of partial epithelial pocket con-taining such granulations. Formation of chole-steatoma in this case, the author explains, is on the theory that occlusion of external meatus caused accumulation of casted off surface epi-thelia during the process of wound healing ; this process acting as stimulant in some such manner to activate the germinal layer of the skin in that area relevant to increased rate of epithelial formation and, thereby, into choles-teatoma. Neither the middle nor the inner ear was involved in the process; hearing loss which was noted as mostly affecting high tones recover-ed after the operation; and, serum cholestrin by blood analysis was not increased.