Eugen Ionescu1, Pierre Reynard2, Aurélie Coudert3, Lucian Roiban4, Aïcha Ltaief Boudrigua5, Hung Thai-Van2. 1. Department of Audiology and Otoneurological Evaluation - Lyon University Hospital, Lyon, France;Paris Hearing Institute, Institut Pasteur, Paris, France. 2. Department of Audiology and Otoneurological Evaluation - Lyon University Hospital, Lyon, France;Claude Bernard Lyon 1 University, Lyon, France;Paris Hearing Institute, Institut Pasteur, Paris, France. 3. Department of Otolaryngology - Head - Neck Surgery, Edouard Herriot Hospital - Hospices Civils de Lyon, Lyon, France;Integrative Multisensory Perception Action - Cognition Team - ImpAct, Lyon Neuroscience Research Center, Lyon, France. 4. Univ Lyon, INSA-Lyon, CNRS, UCBL, MATEIS, UMR 5510, Villeurbanne, France. 5. Department of Radiology, Hospices Civils de Lyon, Lyon, France.
Abstract
OBJECTIVES: This study aimed to present 3 different clinical stages in patients presenting with superior semicircular canal dehiscence (SSCD) by the superior petrosal sinus (SPS). A specific 3-class classification based on clinical, radiological, and audio-vestibular arguments is proposed. MATERIALS AND METHODS: We retrospectively compared clinical and radiological findings in 3 patients with different degrees of audio-vestibular dysfunction in whom the imagery evocated the diagnosis of SSCD by SPS. Imaging sensitivity was improved by combining inner ear high-resolution computed tomography (HRCT) scan and magnetic resonance imaging in fusion, allowing us to compare and corroborate clinical and audio-vestibular findings in each case with the imagery. RESULTS: HRCT and 3T inner ear fusion imaging highlighted a direct contact and/or compression between SPS and the membranous superior semicircular canal (SSC). We propose a new classification of SSCD by SPS. Class "A" corresponds to an HRCT image with a "cookie bite" and thin bone still covering the SSC. Class "B" corresponds to a "cookie bite" image with confirmed contact between the SPS wall and the membranous SSC in MRI labyrinthine sequences. Class "C" type corresponds to a "cookie bite" image, contact, and obvious compression of the membranous SSC by SPS on MRI sequences. CONCLUSION: Anatomical systematization is needed for daily practice. This classification of SSCD by SPS would contribute to a better understanding of the wide variety and variability in the occurrence and onset of symptoms.
OBJECTIVES: This study aimed to present 3 different clinical stages in patients presenting with superior semicircular canal dehiscence (SSCD) by the superior petrosal sinus (SPS). A specific 3-class classification based on clinical, radiological, and audio-vestibular arguments is proposed. MATERIALS AND METHODS: We retrospectively compared clinical and radiological findings in 3 patients with different degrees of audio-vestibular dysfunction in whom the imagery evocated the diagnosis of SSCD by SPS. Imaging sensitivity was improved by combining inner ear high-resolution computed tomography (HRCT) scan and magnetic resonance imaging in fusion, allowing us to compare and corroborate clinical and audio-vestibular findings in each case with the imagery. RESULTS: HRCT and 3T inner ear fusion imaging highlighted a direct contact and/or compression between SPS and the membranous superior semicircular canal (SSC). We propose a new classification of SSCD by SPS. Class "A" corresponds to an HRCT image with a "cookie bite" and thin bone still covering the SSC. Class "B" corresponds to a "cookie bite" image with confirmed contact between the SPS wall and the membranous SSC in MRI labyrinthine sequences. Class "C" type corresponds to a "cookie bite" image, contact, and obvious compression of the membranous SSC by SPS on MRI sequences. CONCLUSION: Anatomical systematization is needed for daily practice. This classification of SSCD by SPS would contribute to a better understanding of the wide variety and variability in the occurrence and onset of symptoms.
Authors: Sarah Lookabaugh; Hillary R Kelly; Margaret S Carter; Marlien E F Niesten; Michael J McKenna; Hugh Curtin; Daniel J Lee Journal: Otol Neurotol Date: 2015-01 Impact factor: 2.311
Authors: Eugen C Ionescu; Aurelie Coudert; Pierre Reynard; Eric Truy; Hung Thai-Van; Aicha Ltaief-Boudrigua; Francis Turjman Journal: Front Neurol Date: 2018-08-20 Impact factor: 4.003
Authors: Pierre Reynard; Samar Idriss; Aicha Ltaief-Boudrigua; Pierre Bertholon; Andreea Pirvan; Eric Truy; Hung Thai-Van; Eugen C Ionescu Journal: Front Neurol Date: 2022-01-11 Impact factor: 4.003