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Junichi Suzuki - One of the best experts on this subject based on the ideXlab platform.

  • Mastoid pneumatization in children with congenital cholesteatoma an aspect of the formation of open type and closed type cholesteatoma
    Laryngoscope, 1998
    Co-Authors: Yukiko Iino, Mitsutoshi Hiraishi, Takao Yabe, Yukako Imamura, Junichi Suzuki
    Abstract:

    Objectives : To clarify Mastoid pneumatization in children with congenital cholesteatoma and compare their clinical characteristics. Study Design: The Mastoid pneumatization of 34 children with congenital middle ear cholesteatoma, of 34 age-matched children with unilateral acquired cholesteatoma, and of 17 age-matched control children without middle ear diseases was studied. Methods: The sizes of the Mastoid Cells were measured from 1.5-mm sliced semiaxial sections of a temporal bone computed tomography scan. The sum of the two areas from the two images, one showing the lateral semicircular canal and the other, 3 mm below this, was defined as the area of the pneumatized Mastoid Cells. Results: The Mastoid Cells in ears of children with congenital cholesteatoma were poorly pneumatized compared with those of control children without middle ear diseases, but were better pneumatized compared with those of children with acquired cholesteatoma. In children with congenital cholesteatoma, the degree of pneumatization in the cholesteatoma side was significantly poorer than that in the opposite side. A well-pneumatized Mastoid was seen in ears with no episode of otitis media, in ears with the open-type cholesteatoma, and in ears with ossicular anomalies. Conclusions: The presence of cholesteatoma matrix accelerates the inflammatory response when middle ear infections occur, and this probably leads to the suppression of Mastoid pneumatization. The authors also propose the hypothesis that cholesteatoma in most congenital cases is the open type, and that middle ear inflammation may contribute to the formation of cystic and closed-type cholesteatoma.

Karl Hormann - One of the best experts on this subject based on the ideXlab platform.

  • classification of the external auditory canal cholesteatoma
    Laryngoscope, 2005
    Co-Authors: Ramin Naim, Fred H Linthicum, Ted Shen, Gregor Bran, Karl Hormann
    Abstract:

    Objectives/Hypothesis: The external auditory canal cholesteatoma (EACC) is a rare disease in the field of otolaryngology. Only 1 in 1,000 new otologic patients present with this entity, which was first described by Toynbee. The aim of this article is to classify EACC by different histopathologic and clinical findings of patients presenting to the Department of Otolaryngology at the University of Mannheim, Germany. Methods: From 2000 to 2004, 17 patients presented to our clinic with EACC. The cholesteatoma were treated surgically, and the specimens were investigated histologically. Clinical findings were also recorded. We classified four stages: stage I with hyperplasia of the canal epithelium, stage II including periosteitis, Stage III including a defective bony canal, and stage IV showing an erosion of adjacent anatomic structure. Results: Eight patients presented with stage II, five patients with stage III, three with stage I, and only one patient presented with erosion of the Mastoid Cells, which was determined as stage IV. Conclusion: In summary, our classification serves to describe the different histopathologic and clinical stages of EACC.

Yukiko Iino - One of the best experts on this subject based on the ideXlab platform.

  • Mastoid pneumatization in children with congenital cholesteatoma an aspect of the formation of open type and closed type cholesteatoma
    Laryngoscope, 1998
    Co-Authors: Yukiko Iino, Mitsutoshi Hiraishi, Takao Yabe, Yukako Imamura, Junichi Suzuki
    Abstract:

    Objectives : To clarify Mastoid pneumatization in children with congenital cholesteatoma and compare their clinical characteristics. Study Design: The Mastoid pneumatization of 34 children with congenital middle ear cholesteatoma, of 34 age-matched children with unilateral acquired cholesteatoma, and of 17 age-matched control children without middle ear diseases was studied. Methods: The sizes of the Mastoid Cells were measured from 1.5-mm sliced semiaxial sections of a temporal bone computed tomography scan. The sum of the two areas from the two images, one showing the lateral semicircular canal and the other, 3 mm below this, was defined as the area of the pneumatized Mastoid Cells. Results: The Mastoid Cells in ears of children with congenital cholesteatoma were poorly pneumatized compared with those of control children without middle ear diseases, but were better pneumatized compared with those of children with acquired cholesteatoma. In children with congenital cholesteatoma, the degree of pneumatization in the cholesteatoma side was significantly poorer than that in the opposite side. A well-pneumatized Mastoid was seen in ears with no episode of otitis media, in ears with the open-type cholesteatoma, and in ears with ossicular anomalies. Conclusions: The presence of cholesteatoma matrix accelerates the inflammatory response when middle ear infections occur, and this probably leads to the suppression of Mastoid pneumatization. The authors also propose the hypothesis that cholesteatoma in most congenital cases is the open type, and that middle ear inflammation may contribute to the formation of cystic and closed-type cholesteatoma.

Ramin Naim - One of the best experts on this subject based on the ideXlab platform.

  • classification of the external auditory canal cholesteatoma
    Laryngoscope, 2005
    Co-Authors: Ramin Naim, Fred H Linthicum, Ted Shen, Gregor Bran, Karl Hormann
    Abstract:

    Objectives/Hypothesis: The external auditory canal cholesteatoma (EACC) is a rare disease in the field of otolaryngology. Only 1 in 1,000 new otologic patients present with this entity, which was first described by Toynbee. The aim of this article is to classify EACC by different histopathologic and clinical findings of patients presenting to the Department of Otolaryngology at the University of Mannheim, Germany. Methods: From 2000 to 2004, 17 patients presented to our clinic with EACC. The cholesteatoma were treated surgically, and the specimens were investigated histologically. Clinical findings were also recorded. We classified four stages: stage I with hyperplasia of the canal epithelium, stage II including periosteitis, Stage III including a defective bony canal, and stage IV showing an erosion of adjacent anatomic structure. Results: Eight patients presented with stage II, five patients with stage III, three with stage I, and only one patient presented with erosion of the Mastoid Cells, which was determined as stage IV. Conclusion: In summary, our classification serves to describe the different histopathologic and clinical stages of EACC.

Marco Caversaccio - One of the best experts on this subject based on the ideXlab platform.

  • Glass ionomer cement in otological microsurgery: experience over 16 years
    European Archives of Oto-Rhino-Laryngology, 2015
    Co-Authors: F. Righini-grunder, Rudolf Häusler, S. Chongvisal, Marco Caversaccio
    Abstract:

    A retrospective evaluation of glass ionomer cement (GIC) in middle ear surgery with emphasis on short- and long-term safety was conducted at the tertiary referral center. GIC was applied between 1995 and 2006 in 444 patients in otologic surgery. Technical aspects, safety, benefits and complications due to GIC were analysed until 2011 (follow-up 5–16 years; mean 10 years). GIC was applied in stapes surgery (228 primary, 92 revisions), cochlear implants (108) and implantable hearing aids (7), ossiculoplasty (7), for coverage of opened Mastoid air Cells towards the external ear canal (1) and inner ear fistula closure (1). GIC turned out to be very handy in stapes surgery for optimal prosthesis fixation at the incus (260) and on the malleus handle (60) without complications. Results suggest that GIC may diminish the danger of incus necrosis in primary stapedotomy. In cochlear implants and implantable hearing aids, GIC was used for casing alone (74), casing and electrode fixation (27) and electrode alone fixation (14). Inflammatory reactions were observed in five cases (4.3 %), mostly after trauma. Broken cement fragments appeared to promote foreign body rejection. In seven cases an incudo-stapedial gap was repaired with GIC with excellent hearing gain; in three cases (43 %) revision surgery was needed due to cement breakage. In one case, GIC was applied for a watertight coverage of opened Mastoid Cells, and in the other for fistula closure of the lateral semi-circular canal over cartilage, covered with bone pathé; follow-up was uneventful. Targeted use of GIC in middle ear surgery rarely poses problems. GIC cannot be used in neuro-otosurgery in contact with cerebrospinal fluid because of possible aluminium encephalopathy.

  • glass ionomer cement in otological microsurgery experience over 16 years
    European Archives of Oto-rhino-laryngology, 2015
    Co-Authors: F Righinigrunder, Rudolf Häusler, S. Chongvisal, Marco Caversaccio
    Abstract:

    A retrospective evaluation of glass ionomer cement (GIC) in middle ear surgery with emphasis on short- and long-term safety was conducted at the tertiary referral center. GIC was applied between 1995 and 2006 in 444 patients in otologic surgery. Technical aspects, safety, benefits and complications due to GIC were analysed until 2011 (follow-up 5–16 years; mean 10 years). GIC was applied in stapes surgery (228 primary, 92 revisions), cochlear implants (108) and implantable hearing aids (7), ossiculoplasty (7), for coverage of opened Mastoid air Cells towards the external ear canal (1) and inner ear fistula closure (1). GIC turned out to be very handy in stapes surgery for optimal prosthesis fixation at the incus (260) and on the malleus handle (60) without complications. Results suggest that GIC may diminish the danger of incus necrosis in primary stapedotomy. In cochlear implants and implantable hearing aids, GIC was used for casing alone (74), casing and electrode fixation (27) and electrode alone fixation (14). Inflammatory reactions were observed in five cases (4.3 %), mostly after trauma. Broken cement fragments appeared to promote foreign body rejection. In seven cases an incudo-stapedial gap was repaired with GIC with excellent hearing gain; in three cases (43 %) revision surgery was needed due to cement breakage. In one case, GIC was applied for a watertight coverage of opened Mastoid Cells, and in the other for fistula closure of the lateral semi-circular canal over cartilage, covered with bone pathe; follow-up was uneventful. Targeted use of GIC in middle ear surgery rarely poses problems. GIC cannot be used in neuro-otosurgery in contact with cerebrospinal fluid because of possible aluminium encephalopathy.