Warning: mkdir(): Permission denied in /home/virtual/lib/view_data.php on line 87 Warning: chmod() expects exactly 2 parameters, 3 given in /home/virtual/lib/view_data.php on line 88 Warning: fopen(/home/virtual/audiology/journal/upload/ip_log/ip_log_2024-07.txt): failed to open stream: No such file or directory in /home/virtual/lib/view_data.php on line 95 Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/virtual/lib/view_data.php on line 96 The Association of Anterior Inferior Cerebellar Artery in Internal Auditory Canal with Tinnitus and Hearing Loss.
Korean J Audiol Search


Auditory and Vestibular Disorders, Auditory Neuroscience
Korean Journal of Audiology 2011;15(2):67-71.
The Association of Anterior Inferior Cerebellar Artery in Internal Auditory Canal with Tinnitus and Hearing Loss.
Han Seok Yoo, Dong Wook Lee, Hyun Jung Min, Seung Hwan Lee, Chul Won Park
Department of Otolaryngology-Head and Neck Surgery, College of Medicine, Hanyang University, Guri, Korea. shleemd@hanyang.ac.kr
Tinnitus is a common disorder, but the etiology of this disorder remains unknown. The objective of this study was to assess the correlation between anatomical type and the thickness of the anterior inferior cerebellar artery (AICA) loop with tinnitus, using 3D-fast imaging employing steady state acquisition magnetic resonance image (MRI).
74 patients with tinnitus and 82 asymptomatic controls were included in this study. Otologic symptoms, which was measured based on the results of a pure tone audiometry, were reviewed. We evaluated the position and thickness of the AICA vascular loop in 3D-FIESTA MRI using two scoring systems. The first system was Chavda classification based on the anatomical location of the AICA loop. The second scoring system was used to measure the thickness of the AICA loop. The AICA loops were classified into two groups based on thickness, thinner than adjacent facial nerve and thicker than the facial nerve.
Ears with type I, II AICA loops showed significantly higher rates of tinnitus than those with type III. There was no association between the type of AICA loop and subtype of tinnitus (pulsatile, nonpulsatile). There was no association between the type of tinnitus and hearing loss. Ears with thinner AICA loop had a higher rate of tinnitus than those with thicker AICA loop.
The type I, II and thinner AICA loop was significantly correlated with tinnitus. Compression of VIIIth cranial nerve by AICA loops at a cerebellopontine angle and impaired blood flow through the vessel may be the pathophysiology of tinnitus.
Keywords: Tinnitus;Vestibulocochlear nerve;Hearing loss;Magnetic resonance imaging


  1. Lockwood AH, Salvi RJ, Burkard RF. Tinnitus. N Engl J Med 2002;347:904-10.

  2. Jannetta PJ. Neurovascular cross-compression in patients with hyperactive dysfunction symptoms of the eighth cranial nerve. Surg Forum 1975;26:467-9.

  3. Ryu H, Yamamoto S, Sugiyama K, Nishizawa S, Nozue M. Neurovascular compression syndrome of the eighth cranial nerve. Can the site of compression explain the symptoms? Acta Neurochir (Wien) 1999;141:495-501.

  4. Brookes GB. Vascular-decompression surgery for severe tinnitus. Am J Otol 1996;17:569-76.

  5. Reisser C, Schuknecht HF. The anterior inferior cerebellar artery in the internal auditory canal. Laryngoscope 1991;101:761-6.

  6. Kanzaki J, Ogawa K. Internal auditory canal vascular loops and sensorineural hearing loss. Acta Otolaryngol Suppl 1988;447:88-93.

  7. De Carpentier J, Lynch N, Fisher A, Hughes D, Willatt D. MR imaged neurovascular relationships at the cerebellopontine angle. Clin Otolaryngol Allied Sci 1996;21:312-6.

  8. McDermott AL, Dutt SN, Irving RM, Pahor AL, Chavda SV. Anterior inferior cerebellar artery syndrome: fact or fiction. Clin Otolaryngol Allied Sci 2003;28:75-80.

  9. Møller AR. Vascular compression of cranial nerves: II: pathophysiology. Neurol Res 1999;21:439-43.

  10. Brandt T, Dieterich M. VIIIth nerve vascular compression syndrome: vestibular paroxysmia. Baillieres Clin Neurol 1994;3:565-75.

  11. De Ridder D, Møller A, Verlooy J, Cornelissen M, De Ridder L. Is the root entry/exit zone important in microvascular compression syndromes? Neurosurgery 2002;51:427-33; discussion 433-4.

  12. Sirikci A, Bayazit Y, Ozer E, Ozkur A, Adaletli I, Cüce MA, et al. Magnetic resonance imaging based classification of anatomic relationship between the cochleovestibular nerve and anterior inferior cerebellar artery in patients with non-specific neuro-otologic symptoms. Surg Radiol Anat 2005;27:531-5.

  13. Gultekin S, Celik H, Akpek S, Oner Y, Gumus T, Tokgoz N. Vascular loops at the cerebellopontine angle: is there a correlation with tinnitus? AJNR Am J Neuroradiol 2008;29:1746-9.

  14. De Ridder D, Ryu H, Møller AR, Nowé V, Van de Heyning P, Verlooy J. Functional anatomy of the human cochlear nerve and its role in microvascular decompressions for tinnitus. Neurosurgery 2004;54:381-8; discussion 388-90.

  15. Applebaum EL, Valvasorri G. Internal auditory canal vascular loops: audiometric and vestibular system findings. Am J Otol 1985;Suppl:110-3.

Share :
Facebook Twitter Linked In Google+
METRICS Graph View
  • 4,347 View
  • 111 Download

Surgical Anatomy of Cerebellopontine Angle and Internal Auditory Canal2002 ;6(1)


Browse all articles >


Browse all articles >

Editorial Office
The Catholic University of Korea, Institute of Biomedical Industry, 4017
222, Banpo-daero, Seocho-gu, Seoul, Republic of Korea
Tel: +82-2-3784-8551    Fax: +82-0505-115-8551    E-mail: jao@smileml.com                

Copyright © 2024 by The Korean Audiological Society and Korean Otological Society. All rights reserved.

Developed in M2PI

Close layer
prev next