Fig. 4

Three-dimensional real inversion recovery MRI axial scans (left column) and the corresponding MR colored image (right column) of patient no. 14 in the EDD group (Table 1) with left MD A prior to surgery, B 2 weeks after surgery, and C 17 months after surgery. A The first MRI examination, exhibiting a mild cochlear EH (white arrow) and a significant vestibular EH (red arrow) in the left ear. B The second MRI examination showed complete reversal of vestibular (red arrow) and cochlear EH (white arrow), in comparison with the first MRI examination in the same slice level. C The third MRI examination, revealing that the reversal of cochlear hydrops remained unchanged (white arrow), and there was a recurrence of vestibular hydrops (red arrow) in comparison with the first and second MRI examinations in the same slice level. EDD endolymphatic sac drainage, EH endolymphatic hydrops, MD Meniere’s disease, MRI magnetic resonance imaging