先天性耳小骨全欠損症例
1981 年 27 巻 3 号 p. 496-499
詳細
1981 年 27 巻 3 号 p. 496-499
Malformation of the middle ear ossicles is frequently observed during microsurgery of the patients with congenital conductive deafness. The authers encountered the 21 years old female with a conductive deafness since her childhood.
Exploratory of her left ear revealed the remnant of the manubrium of the malleus and long crus of the incus or the stapes. The head and body of the malleus and the head, body and short crus of the incus were not found in the tympanic cavity. Consequently we suspected these findings agree with the theory of HANSON et at advocating the manubrium of the malleus and long crus of the incus develope from the second visseral arch.
Reconstruction of the ossicles was made in replacing a Teflon-strut between tympanic membrane and the footplate. For avoiding the extrusion of the Teflon-strut, homograft ossicle was inserted in the space of the tympanic membrane and Teflon-strut.
Postoperatively hearing progressed 25 dB in air conduction and air-bone gap closed in 10 dB.
