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. 2018 Dec 20;86(2):165–173. doi: 10.1016/j.bjorl.2018.10.014

Table 1.

Three-stage grading of endolymphatic hydrops using magnetic resonance imaging.

Hydrops stage Vestibulea Cochlea
None Area ratio ≤ 1/3 No displacement of Reissner's membrane.
Mild 1/3 < Area ratio < 1/2 Displacement of Reissner's membrane, with endolymphatic space area not exceeding scala vestibule area.
Significant Area ratio > 1/2 Endolymphatic space area exceeds scala vestibule area.
a

The ratio of the area of the endolymphatic space to the area of the vestibular fluid space (sum of the areas of the endolymphatic and the perilymphatic spaces).