CT imaging of superior semicircular canal dehiscence: Added value of reformatted images

Ceylan, Naim; Bayraktaroğlu, Selen; Alper, Hüdaver; Savaş, Recep; Bilgen, Cem; Kirazlı, Tayfun; Güzelmansur, İsmail; Ertürk, Şükrü Mehmet

doi:10.3109/00016481003602108

Cited by 47 publications

(39 citation statements)

References 18 publications

(49 reference statements)

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“…9,[12][13][14] However, significant differences have been found between autopsy-proven versus CT-detected SSC dehiscence. [15][16][17] It has been proposed that reformatted CT images oriented parallel (plane of Po¨schl) and orthogonal (plane of Stenver) to the plane of the SSC may improve the sensitivity and specificity in detecting SSC dehiscence.…”

Section: Introductionmentioning

confidence: 81%

“…17,21 Previous studies suggest that radiologic evidence of SSC dehiscence may be overestimated, indicating that a dehiscence at the arcuate eminence may be observed in asymptomatic patients. 14,16,17 It should be pointed out, however, that these studies are based on older scanning protocols with 1.0-mmthick direct transverse and coronal images, or with 1.0-mm-thick reformatted images in the plane of Po¨schl and Stenver.…”

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confidence: 99%

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Diagnostic performance of reformatted isotropic thin-section helical CT images in the detection of superior semicircular canal dehiscence

Sparacia

Iaia

2017

Neuroradiol J

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Purpose The purpose of this article is to assess the diagnostic performance of computed tomography (CT) reformatted images for detection of superior semicircular canal (SSC) dehiscence. Material and methods Forty-two patients, with sound- and/or pressure-induced vestibular symptoms, and 42 control participants underwent helical CT examination with a highly collimated beam (0.5 mm). Reformatted images of the vestibular labyrinth were obtained in the standard axial and coronal planes (group A images), and in a plane parallel and perpendicular to the SSC (group B images). Diagnostic performance obtained by evaluating the group A images alone and the group B images alone was analyzed by using the area under the receiver operating characteristic curve (AUC). Results The diagnostic performance of group A images was AUC = 0.929 with an overall accuracy of 92.9%. The diagnostic performance of group B images was AUC = 0.988 with an overall accuracy of 98.8%. The evaluation of group B images alone showed an improved diagnostic performance over the group A images alone. Conclusion Thin-section 0.5-mm collimation CT with reformatted images oriented in the plane parallel and perpendicular to the SSC improves diagnostic accuracy in assessing for SSC dehiscence in comparison to CT images with reconstructions limited to traditional axial and coronal planes

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Section: Introductionmentioning

confidence: 81%

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confidence: 99%

Diagnostic performance of reformatted isotropic thin-section helical CT images in the detection of superior semicircular canal dehiscence

Sparacia

Iaia

2017

Neuroradiol J

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“…En la actualidad, a pesar de la resolución de los mé-todos de diagnóstico por imagen, existen discrepancias sobre la prevalencia real de dicho síndrome ya que los estudios radiológicos nos indican porcentajes marcadamente superiores que los anatómicos. 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.…”

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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“…Although 1-mm thick direct coronal images have a high sensitivity for the detection of SCDS, they have poor specificity when they are compared with submillimeter helical acquisition with reformations [21][22][23]. The CT positive predictive value to detect SCDS using ultrahigh resolution and reconstruction in SC plan, was 93% with a collimation of 0.5 mm and only 50% with a collimation of 1 mm.…”

Section: Ct Scanmentioning

confidence: 91%

Superior semicircular canal dehiscence syndrome as assessed by oVEMP and temporal bone computed tomography imaging

Thabet

AbdelKhalek

Zaghloul

2011

Eur Arch Otorhinolaryngol

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To evaluate the role of oVEMP and multidetector CT scan in patients with superior canal dehiscence syndrome. Prospective study was conducted on nine patients with superior canal dehiscence syndrome (5 females, 4 males) age ranged 19-49 with mean age of 32.7 ± 9.3 years, complaining of intolerance to loud sounds and/or oscillopsia. The mean duration of illness was 18.7 ± 6.9 months, nine normal individuals as control (age and gender matched) were also included in the study. All of them underwent oVEMP and MDCT scan. Patients were of bilateral normal hearing sensitivity with no conductive impairment. All of the studied subjects (patients and controls) had identifiable contralateral oVEMP responses. MDCT scan showed dehiscence in all the patients. The dehiscence was unilateral (n = 7) and bilateral [n = 2 the other ear had a defect of 2 mm and thus was excluded from the study for fear or false diagnosis of Superior semicircular canal dehiscence syndrome (SCDS)]. Unlike the normal subject (nI = 0.94 µV ± 0.03 and pI = -0.42 µV ± 0.09), with stimulation of the affected side in SCDS, there were augmented amplitude responses (nI = 2.64 µV ± 0.35 and pI = -3.10 µV ± 0.44) in the eye contralateral to the stimulus "contralateral to the lesion". Mean oVEMP threshold for SCDS ears were 82.5 ± 7.55 dBnHL compared to 100 ± 5.77 dBnHL of the control ears. We concluded that combination of physiological and anatomical information from oVEMP and MDCT increased accuracy for diagnosis of dehiscence of superior semicircular canal.

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CT imaging of superior semicircular canal dehiscence: Added value of reformatted images

Cited by 47 publications

References 18 publications

Diagnostic performance of reformatted isotropic thin-section helical CT images in the detection of superior semicircular canal dehiscence

Diagnostic performance of reformatted isotropic thin-section helical CT images in the detection of superior semicircular canal dehiscence

Peculiaridades Anatómicas del Canal Semicircular Superior y su Posible Implicancia Clínica

Superior semicircular canal dehiscence syndrome as assessed by oVEMP and temporal bone computed tomography imaging

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