nclusion criteria:  Major subject (≥18 years old), Subject having presented an episode of upper vestibular neuritis recorded on the Video Head Impulse Test Ulmer device at the HUS between 01/01/2016 and 01/31/2020, Subject not having expressed his opposition, after information, to the reuse of his data for the purposes of this research.  Exclusion criteria:  Patient who expressed his opposition to participating in the study, Total vestibular neuritis, impossibility of providing the subject with enlightened information (difficulties in understanding the subject, etc.) Subject under safeguard of justice, Subject under guardianship or guardianship, Lack of video head impulse test data.