Hostname: page-component-cc8bf7c57-qfg88 Total loading time: 0 Render date: 2024-12-11T01:39:05.696Z Has data issue: false hasContentIssue false

Practicality analysis of JOS staging system for congenital cholesteatoma: Japan Multicenter study (2009–2010)

Presenting Author: Yuka Morita

Published online by Cambridge University Press:  03 June 2016

Yuka Morita
Affiliation:
Niigata university
Tetsuya Tono
Affiliation:
Miyazaki University
Yutaka Yamamoto
Affiliation:
Jikei University School of Medicine
Hiromi Kojima
Affiliation:
Jikei University School of Medicine
Masafumi Sakagami
Affiliation:
Hyogo College of Medicine
Yasuo Mishiro
Affiliation:
Hyogo College of Medicine
Taeko Okuno
Affiliation:
Mitsui Memorial Hospital
Yasuyuki Hinohira
Affiliation:
Kamio Memorial Hospital / Syowa University
Keiji Matsuda
Affiliation:
Miyazaki University
Sho Hashimoto
Affiliation:
National Sendai Medical Center
Rights & Permissions [Opens in a new window]

Abstract

Type
Abstracts
Copyright
Copyright © JLO (1984) Limited 2016 

Learning Objectives:

Introduction: Potsic classification has been widely used as the classification of congenital cholesteatoma. According to this classification, destruction of ossiculs is one of the important points. And the stage will be progressed if the ossicular chain is destructed even in the case of small cholesteatoma which is limited in tympanic cavity. The committee on Nomenclature of the Japan Otological Society (JOS) was appointed in 2004 to create a cholesteatoma staging system widely applicable in Japan and as simple as possible to use in a clinical practice. We introduce our staging system about congenital cholesteatoma.

Methods: A total of 599 ears that underwent surgery for fresh cholesteatoma between 2009 and 2010 at 6 institutions in Japan were recruited and cases with congenital cholesteatoma were selected. In order to know the progress site reliably, we selected strictly the cases which could be obtained surgical records in details. We evaluated the progression of cholesteatoma according to the 2015 JOS cholesteatoma staging and classification system as followed;

Stage I: limited in tympanic cavity (Ia;anterior part, Ib;posterior part, Ic; both of them)

Stage ll: beyond tympanic cavity

Stage III: associated with intratemporal complications

Stage IV: associated with intracranial complications

Results: Seventy one ears of 599 ears were diagnosed for congenital cholesteatoma and 37 ears of 71 have been studied. Six ears were classified for Stage Ia, 11 ears for lb, 1 ear for Ic, 17 ears for II and 2 ears for III. Concerning about the pathology of stapes in Stage l, the missing rate of stapes superstructure was 0%, 54.5% and 100% in Stage Ia, Ib and Ic, respectively.

Conclusions: Congenital cholesteatoma which was limited in tympanic cavity was different in stapes status by the part of existence of cholesteatoma. Especially in this study, Stage Ib was most common in Stage I. Our staging system which is classified from point of the cholesteatoma extent is simple and useful.