Case Report

The Narrow Internal Auditory Canal with Triplication on the Left Side and with Duplication on the Right Side: Radiological Findings

Volume: 6 Number: 2 August 31, 2020
EN

The Narrow Internal Auditory Canal with Triplication on the Left Side and with Duplication on the Right Side: Radiological Findings

Abstract

The constricted internal auditory canal with duplication or triplication of the temporal bone is a very rare anomaly with only 23 cases in 16 reports in the literature, and only one of them is a constricted triplicated internal auditory canal (IAC) in which contralateral IAC is normal. We present the case with the right-sided constricted duplicated IAC and the left-sided narrow triplicated internal auditory canal. Computerized tomography (CT) revealed that the internal auditory canals separated by a bony septum into two canals on the right lateral and into three canals on the left lateral. Manyetik resonance (MR) imaging showed bilateral aplasia of cohlear nerve.

Keywords

narrow duplicated , triplicated internal auditory canal , computed tomography , magnetic resonance imaging , congenital hearing loss

References

  1. Baik HW, Yu H, Kim KS, Kim GH. A narrow internal auditory canal with duplication in a patient with congenital sensorineural hearing loss. Korean J Radiol. 2008; 9 (suppl) :S22-25.
  2. Casselman JW, Offeciers FE, Govaerts PJ, Kuhweide R, Geldof H, Somers T, D'Hont G. Aplasia and hypoplasia of the vestibulocochlear nerve: diagnosis with MR imaging. Radiology. 1997; 202:773-781.
  3. Cho YS, Na DG, Jung JY, Hong SH. J Narrow internal auditory canal syndrome: parasaggital reconstruction. Laryngol Otol. 2000; 114:392-394.
  4. Coelho LO, Ono SE, Neto AC, Polanski JF, Buschle M. Bilateral narrow duplication of the internal auditory canal. J Laryngol Otol. 2010; 4:1003-1006.
  5. Curtin H, May M. Double internal auditory canal associated with progressive facial weakness. Am J Otol. 1986; 7:275-281.
  6. Demir OI, Cakmakci H, Erdag TK, Men S. Narrow duplicated internal auditory canal: radiological findings and review of the literature. Pediatr Radiol. 2005; 35:1220-1223.
  7. Ferreira T, Shayestehfar B, Lufkin R. Narrow, duplicated internal auditory canal. Neuroradiology. 2003; 45:308-310. Goktas Bakar T, Karadag D, Calisir C, Adapinar B. Bilateral narrow duplicated internal auditory canal. Eur Arch Otorhinolaryngol. 2008; 265:999-1001.
  8. Guirado CR. Malformations of the inner auditory canal. Rev Laryngol Otol Rhinol 1992; 113:419-421. Kesser BW, Raghavan P, Mukherjee S, Carfrae M, Essig G, Hashisaki GT. Duplication of the internal auditory canal: radiographic imaging case of the month. Otol Neurotol. 2010; 31:1352-1353.
  9. Kono T, Kuwashima S, Arakawa H, Yamazaki E, Kitajima K, Ejima Y, Ishikawa T, Hashimoto T, Kaji Y. Narrow duplicated internal auditory canal: a rare inner ear malformation with sensorineural hearing loss. Arch Otolaryngol Head Neck Surg. 2009; 135:1048-1051.
  10. Lee SY, Cha SH, Jeon MH, Bae IH, Han GS, Kim SJ, Park KS. Narrow duplicated or triplicated internal auditory canal (3 cases and review of literature): can we regard the separated narrow internal auditory canal as the presence of vestibulocochlear nerve fibers? J Comput Assist Tomogr. 2009; 33:565-570.
Vancouver
1.Aydın Korkmaz. The Narrow Internal Auditory Canal with Triplication on the Left Side and with Duplication on the Right Side: Radiological Findings. Mid Blac Sea J Health Sci. 2020 Aug. 1;6(2):267-72. doi:10.19127/mbsjohs.752502