1. A, Normal labyrinth: interscalar septum (thin arrow), scala tympani (large arrowhead), osseous spiral lamina/cochlear duct (thick arrow), scala vestibuli (small arrowhead), saccule (dashed arrow), and utricle (dotted arrow).
A, Normal labyrinth: interscalar septum (thin arrow), scala tympani (large arrowhead), osseous spiral lamina/cochlear duct (thick arrow), scala vestibuli (small arrowhead), saccule (dashed arrow), and utricle (dotted arrow). B, Cochlear hydrops grade I with irregular dilation and partial obstruction of the scala vestibuli (arrows). In vestibular hydrops grade I, dilation of the endolymphatic space (dotted arrow) encompasses >50% of the vestibulum. A circular perilymphatic space (dashed arrow) remains visible. C, Cochlear hydrops grade II with total obliteration of the scala vestibuli (arrows). In vestibular hydrops grade II, dilation of the endolymphatic space leads to effacement of the perilymphatic space (dotted arrow).
K. Baráth et al. AJNR Am J Neuroradiol 2014;35:
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