KNOW HOW TO POSITION THE SACCULE AND UTRICULE IN SCANNING

Inclusion Criteria:

• Adults (≥18 years old) and minors (≥ 6 years old)
• Subject having received an MRI of the internal ear canals from the HUS between 01/01/2018 and 01/01/2021 or a CT scan of the rocks between 07/01/2015 and 01/01/2021
• Normal MRI or CT on the side opposite the pathology.
• Normal tonal audiogram on the side opposite the pathology (peripheral facial paralysisassumed to be cold for MRI and petrous fracture for CT).
• Subject who has not expressed his opposition, after information, to the reuse of hisdata for the purposes of this research.
• Holders of authority who have not expressed their opposition, after information, tothe reuse of their child's data for the purposes of this research

Exclusion Criteria:

• Subject having expressed opposition to participating in the study
• Holders of parental authority who have expressed their opposition to the reuse oftheir child's data for the purposes of this research
• Imaging with artifacts
• Absence of pure-tone audiogram or its abnormality on the side of the ear studied
• Any malformation or pathology of the vestibule on imaging on the side of the earstudied
• Subjects under guardianship or curatorship