SUBJECTS AND METHODS: Twenty patients with congenital oval window malformations who were not candidates for ossicular reconstruction underwent lateral semicircular canal fenestration. A skin graft was placed over the perforated fascial graft on the fenestrated area.
RESULTS: The median preoperative mean air conduction (MAC) was 56.9 dB (50.0 dB median air-bone). Postoperative median MAC gain of 34.3 dB (P < 0.001) and the median air-bone gap of 18.8 dB were observed. The mean bone conduction (MBC) did not show any significant changes postoperatively (P = 0.12). No sensorineural hearing loss, tinnitus, or imbalance was observed.
CONCLUSION: We demonstrated hearing improvement after lateral semicircular canal fenestration. This technique can be considered as an alternative for patients with middle ear anomalies who are not candidates for ossicular reconstruction.
2. TabaeeAOwezardakVSelesnickSH.Congenital disorders of the middle ear. In: LalwaniAK.Current Diagnosis and Treatment in Otolaryngology–Head and Neck Surgery. 2nd edition. United States of America: McGraw Hill Companies, Inc.; 2008. p. 641.
3.
3. TosM.Otosclerosis. In: Tos M Surgical Solutions for Conductive Hearing Loss. Stuttgart, Germany: Thieme; 2000. p. 85.
4.
4. Committee on Hearing and Equilibrium.Committee on Hearing and Equilibrium guidelines for the evaluation of results of treatment of conductive hearing loss. Otolaryngol Head Neck Surg1995;113:186–7.
5.
5. PauHWJustT.Third window vibroplasty: an alternative in surgical treatment of tympanosclerosis obliteration of the oval and round window niche. Otol Neurotol2010;31:225–7.
6.
6. FarriorJBRophieSS.Fenestration of the horizontal semicircular canal in congenital conductive deafness. Laryngoscope1985;95(9 Pt 1):1029–36.
7.
7. YiZYangZLiZ. Bilateral congenital absence of stapes and oval window in 2 members of a family: Etiology and management. Otolaryngol Head Neck Surg2003;128:777–82.
8.
8. ZeiferBSabiniPSonneJ.Congenital absence of the oval window: radiologic diagnosis and associated anomalies. Am J Neuroradiol2000;21:322–7.
9.
9. RibaricKBleekerJDWitHP.Perception of audio frequency vibrations by profoundly deaf subjects after fenestration of the vestibular system. Acta Otolaryngol1992;112:45–9.
10.
10. RibaricKKekicBDergencR.On the capability of the vestibular apparatus to perceive sound stimuli. Acta Otolaryngol1992;112:221–4.
11.
11. SohmerHFreemanSPerezR.Semicircular canal fenestration: improvement of bone, but not air-conducted auditory thresholds. Hear Res2004;187:105–10.
12.
12. BanerjeeAWhyteAAtlasMD.Superior canal dehiscence: review of a new condition. Clin Otolaryngol2005;30:9–15.
13.
13. TjellstormAHakanssonB.The bone-anchored hearing aid. Otolaryngol Clin North Am1995;28:53–72.
