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Radiological diagnosis of incomplete partition type I versus type II: significance for cochlear implantation

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Abstract

Objectives

To investigate an extended cohort of patients with incomplete partition (IP) and examine the adequacy of the existing classifications based on radiological criteria and on their implications for cochlear implantation.

Methods

Patients with IP admitted to a tertiary referral centre during the period 2000–2010 were retrospectively examined. The subjects were initially classified into IP-I, IP-II and atypical cases. For cochlear implant recipients relevant aspects were analysed.

Results

Eighty-three ears (49 patients) with IP were found, 19 with IP-I, 54 with IP-II and 10 atypical. Thirty-three patients received a cochlear implant (11 with IP-I, 19 with IP-II and three atypical) achieving heterogeneous though mostly promising results. Cerebrospinal fluid gushing was the commonest surgical complication, particularly in cases of IP-I. In general, patients with IP-II performed better than those with IP-I.

Conclusions

Cochlear implantation promises adequate hearing rehabilitation for most patients with IP. As we move from IP-I to IP-II better results and lower risk for gushing shall be expected. Based on radiological findings we suggest a modified classification into IP-I, atypical IP-I (with large vestibular aqueduct (LVA) and better partition), IP-II (Mondini deformity) and atypical IP-IIa (without LVA) and b (without LVA but with semicircular canal dysplasia).

Key Points

• Radiological (CT and MR) features are of crucial importance for cochlear implantation

• Imaging can identify two types of incomplete cochlear partition and atypical cases

• Detailed pre-operative radiological assessment can help predict complications and outcome

• A more comprehensive radiological classification of these anomalies is proposed

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Authors and Affiliations

  1. Department of Otorhinolaryngology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany

    Georgios Kontorinis, Alexandros Giourgas & Thomas Lenarz

  2. Department of Neuroradiology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany

    Friedrich Goetz, Heinrich Lanfermann & Anja M. Giesemann

Authors
  1. Georgios Kontorinis
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  2. Friedrich Goetz
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  3. Alexandros Giourgas
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  4. Thomas Lenarz
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  5. Heinrich Lanfermann
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  6. Anja M. Giesemann
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Correspondence to Georgios Kontorinis.

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Kontorinis, G., Goetz, F., Giourgas, A. et al. Radiological diagnosis of incomplete partition type I versus type II: significance for cochlear implantation. Eur Radiol 22, 525–532 (2012). https://doi.org/10.1007/s00330-011-2301-5

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  • DOI: https://doi.org/10.1007/s00330-011-2301-5

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