PMC3995123_01
Patient's audiogram, demonstrating moderate sensorineural hearing loss and poor word discrimination.
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F1
An audiogram revealed moderate sensorineural hearing loss in both ears in the frequency range of 500 Hz to 4000Hz, with slightly better (~10 dB) thresholds in the right ear across the frequency spectrum (Figure 1).
Histopathological sections (celloidin embedded, 20 mum) from this patient's left temporal bone stained with hematoxylin and eosin (H&E): at the base of the cochlea where the base of the modiolus displays dehiscence (A), and spiral ganglion neurons are visible within the internal auditory canal portion of the auditory nerve (B-E).
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F2
Ganglion cells were found scattered throughout the auditory nerve as far as one millimeter medial to its exit from the cochlea (Figure 2).