Dehiscence of the bony roof of the superior semicircular canal in the middle cranial fossa

Tsunoda, Atsunobu; Terasaki, Omi

doi:10.1258/002221502760132377

Cited by 47 publications

(33 citation statements)

References 9 publications

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“…Accordingly, few data exist regarding its prevalence. In cadaver studies, ∼ 0.5% of specimens demonstrated SCD [Carey et al, 2000;Tsunoda and Terasaki, 2002], while an additional 1.4% of specimens showed markedly thin bone (<0.1 mm) covering the SC [Carey et al, 2000]. In addition to these cadaver studies, it may be possible to gain insight into SCD through a radiological evaluation of living subjects [Cloutier et al, 2008;Nadgir et al, 2011;Watson et al, 2000].…”

Section: Introductionmentioning

confidence: 99%

“…However, the etiology of SCD still remains controversial. Embryological mechanisms have been suggested including an embryonic developmental defect by a malposition of the primitive otocyst [Tsunoda and Terasaki, 2002], postnatal failure of bone formation over the SC [Carey et al, 2000;Teixido et al, 2012] or prenatal defect in bone reorganization [Crovetto de la Torre et al, 2005]. From an acquired perspective, trauma or pressure from the overlying temporal lobe may gradually disrupt the SC and cause dehiscence [Minor, 2005;Ogutha et al, 2009].…”

Section: Introductionmentioning

confidence: 99%

“…If the otocyst is situated close to the developing brain during the formation of the bony otic capsule, it may come into direct, continuous contact with the dura mater and lead to SCD [Carey et al, 2000;Tsunoda and Terasaki, 2002]. However, a later study showed that dehiscent SCs were neither more cephalically placed nor oriented vertically compared to those of the controls [Potyagaylo et al, 2005].…”

Section: Introductionmentioning

confidence: 99%

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Thickness of the Bony Otic Capsule: Etiopathogenetic Perspectives on Superior Canal Dehiscence Syndrome

et al. 2015

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The etiology of superior canal dehiscence (SCD) is controversial. An embryological perspective suggests that SCD may occur through the failure of postnatal bone formation over the superior semicircular canal (SC), whereas an acquired theory suggests that trauma or pressure from the overlying temporal lobe could break or gradually thin the SC. We infer the etiology of SCD by comparing the thickness of the bony otic capsule of the unaffected side of SCD patients with that of non-SCD participants. Twelve SCD patients (13 SCD ears and 11 normal ears) and 34 age-matched controls (68 ears) were included. The control group was subdivided into an aerated group (49 ears) and a nonaerated group (19 ears), as defined by the presence of air cells above the SC. A high-resolution temporal bone CT was performed in all participants. The thicknesses of the SC, horizontal canal (HC) and posterior canal (PC) of the unaffected ears of SCD patients were compared with those of the controls. The SC of the unaffected side in the SCD group (n = 11, 0.41 ± 0.23 mm) was significantly thinner than the one in the control group (n = 68, 0.64 ± 0.21 mm, p = 0.002). The HC and PC were also thinner in the SCD group (n = 24, 0.58 ± 0.11 and 1.39 ± 0.31 mm, respectively) than in the controls (0.70 ± 0.08 and 1.61 ± 0.32 mm; p < 0.0001 and p = 0.005, respectively). The SC, HC and PC thicknesses were also compared between the aerated and nonaerated ears within the control group. The SC was significantly thicker in the aerated group (0.73 ± 0.14 mm) than in the nonaerated group (0.60 ± 0.23 mm; p = 0.046); however, no significant difference was observed for the HC and PC thickness (aerated group, n = 49, 0.72 ± 0.07 and 1.67 ± 0.34 mm; nonaerated group, n = 19, 0.70 ± 0.09 and 1.59 ± 0.34 mm; p = 0.350 and p = 0.428, respectively). The bony otic capsule was significantly thinner in the SCD patients than in the controls. However, even within unaffected individuals, SCs lacking overlying air cells were also thinner than those with overlying air cells. These results suggest that both embryological and acquired factors affect the occurrence of SCD.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thickness of the Bony Otic Capsule: Etiopathogenetic Perspectives on Superior Canal Dehiscence Syndrome

et al. 2015

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“…For this study, the data collection was performed for more than one year, and only two cases of SSCDS were diagnosed, reaffirming the rare incidence of this pathology 3,15 .…”

Section: Casementioning

confidence: 59%

Síndrome da deiscência do canal semicircular superior: relato de dois casos

et al. 2017

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The Superior Semicircular Canal Dehiscence Syndrome (SSCDS) is characterized by bone wear layer overlying the superior semicircular canal. Common symptoms of SSCDS the presence of vertigo associated with nystagmus induced by intense sound stimuli or changes in intracranial pressure or middle ear. The aim of this study is to describe the audiological and vestibular findings of two patients diagnosed with Superior Semicircular Canal Deiscence Syndrome, with confirmed diagnosis by computed tomography. Meatoscopy, anamnesis, pure tone audiometry and vocal followed by the acoustic impedance measurements, audiometric Weber, research Tulio phenomenon and Valsalva maneuver, performed by the same researcher in one session were held. Air-bone gap were observed, type A tympanometric curve and acoustic reflex. The air-bone gap is presented with greater amplitude at low frequencies. Hearing complaints were not reported by patients as the first symptoms. Weber showed lateralization in both cases, confirming the presence of gap. The Thulium phenomenon is positive for vertigo in both cases. The Valsalva maneuver showed a change in only one case. Keywords: Hearing; Audiometry; Semicircular Canals; Nystagmus, Pathologic; Dizziness RESUMO A Síndrome da Deiscência do Canal Semicircular Superior (SDCSS) é caracterizada pelo desgaste da camada óssea que recobre o canal semicircular superior. São sintomas comuns da SDCSS a presença de vertigem associada à nistagmos induzidos por estímulos sonoros intensos ou por modificações das pressões intracraniana ou da orelha média. O objetivo deste trabalho é descrever os achados audiólogi-cos e vestibulares de dois pacientes com diagnóstico de Síndrome da Deiscência do Canal Semicircular Superior, com diagnóstico confirmado por meio de tomografia computadorizada. Foram realizadas meatoscopia, anamnese, audiometria tonal e vocal seguida das medidas de imitância acústica, Weber audiométrico, pesquisa do fenômeno de Túlio e manobra de Valsalva, realizados pela mesma pesquisadora em uma única sessão. Foram observados gap aéreo-ósseo, curva timpanométrica tipo A e reflexos acústi-cos presentes. O gap aéreo-ósseo apresenta-se com maior amplitude nas frequências baixas. As queixas auditivas não foram relatadas pelas pacientes como os primeiros sintomas. O Weber mostrou lateralização, nos dois casos, confirmando a presença de gap. O fenômeno de Túlio apresentou-se positivo para vertigem em ambos os casos. A manobra de Valsalva apresentou alteração em apenas um caso.

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“…Así mediante medidas realizadas sobre CT de temporales, Crovetto et al encuentran una incidencia del 3,6% en su serie de 604 temporales, cifra que llega al 4% en la serie de Cloutier et al (2008) y al 9% en el estudio de Williamson et al (2003) encontrando otros autores incidencias incluso superiores (Ceylan et al, 2010;Piton et al, 2008). En cambio en estudios realizados post-mortem y en piezas de osario se calcula que el porcentaje de sujetos afectos de este tipo de dehiscencia en la zona superior del canal es aproximadamente de 0,5% para Carey et al (2000), y para Tsunoda & Terasaki (2002) del 0,4% en huesos aislados y del 1,4 % (1 caso de 69) en cadáveres. Nosotros hemos observado en nuestro estudio anatómico realizado con temporales de cadáveres una incidencia del 1,04 % (1 caso de 48).…”

Section: Discussionunclassified

Peculiaridades Anatómicas del Canal Semicircular Superior y su Posible Implicancia Clínica

et al. 2012

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RESUMEN:El objetivo fue estudiar las peculiaridades en la morfología apical del canal semicircular superior, a nivel de la eminencia arcuata con la finalidad de obtener conclusiones aplicativas. Se estudiaron 48 cabezas de cadáveres humanos (96 huesos temporales), con la intención de identificar la presencia de adelgazamiento o dehiscencia del canal semicircular superior, así como la existencia de surcos vasculares de la eminencia acuata que, discurriendo sobre el techo del canal, pudieran afectar a su integridad anatómica. El estudio incluye un análisis histológico (Tricrómico de Martins) y radiológico (Tomografía Computarizada) de los hallazgos positivos (dehiscencias y adelgazamientos), así como estudio tomográfico de los canales con surcos vasculares visibles. En un caso (1,04 %) hemos observado cómo el canal presentaba un defecto óseo completo (dehiscencia), en tres (3,12%) el canal presentaba una pared muy delgada cuyo grosor no excedía de 0,2 mm. En 12 casos (12,5%) la eminencia arcuata estaba recorrida por surcos por el que discurrían vasos colaterales meníngeos, que determinaron una concavidad entre 0,1 y 0,2 mm, mientras que el grosor medio de dicha pared en estos casos fue de 1,2 mm. De las tres peculiaridades estudiadas, la falta de cobertura ósea es la que produce el síndrome de dehiscencia del canal semicircular superior. Los canales que presentaban una cubierta adelgazada pueden estar predispuestos a una rotura y por lo tanto causar patología en el canal. En cambio la presencia de surcos vasculares que recorren la superficie apical del canal, no parece tener consecuencias al disminuir minimamente su grosor.PALABRAS CLAVE: Canal semicircular superior; Dehiscencia; Pared adelgazada; Surcos vasculares. INTRODUCCIÓNLos canales semicirculares superiores o anteriores se hallan situados en el espesor del peñasco del hueso temporal y forman parte del laberinto posterior del oído interno. Cada uno de ellos describe un arco que aproximadamente describe casi dos tercios de un círculo, y cuya longitud es de 15 a 20 mm, su orientación puede ser oblícuo hacia arriba y afuera o generalmente vertical, existiendo grandes diferencias individuales.Cada canal presenta dos extremos, uno dilatado (ampular), elíptico, con un diámetro de 3 mm y que desemboca en la porción superior y externa del vestíbulo; el otro extremo no ampular resultante de su unión con el del canal posterior, es circular con un diámetro de 1,5 mm y desemboca en la parte interna del vestíbulo.El canal semicircular superior levanta por su bucle la cortical de la superficie antero-superior del peñasco formando un relieve transversal, la eminencia arcuata. Sin embargo esta eminencia no coincide exactamente con el canal semicircular óseo superior siempre. Para Faure et al. (2003) está eminencia sólo corresponde al relieve del canal semicircular superior en el 37%.Un aspecto importante del canal es el espesor de la lámi-na ósea que separa el canal de la fosa cerebral media, que para Tsunoda (2001) Raramente esta cubierta está ausente, siendo entonces el...

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Dehiscence of the bony roof of the superior semicircular canal in the middle cranial fossa

Cited by 47 publications

References 9 publications

Thickness of the Bony Otic Capsule: Etiopathogenetic Perspectives on Superior Canal Dehiscence Syndrome

Thickness of the Bony Otic Capsule: Etiopathogenetic Perspectives on Superior Canal Dehiscence Syndrome

Síndrome da deiscência do canal semicircular superior: relato de dois casos

Peculiaridades Anatómicas del Canal Semicircular Superior y su Posible Implicancia Clínica

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