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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...

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Surgical Induction of Endolymphatic Hydrops by Obliteration of the Endolymphatic Duct

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Published on: January 22, 2010

Profound sensorineural hearing loss in ears with endolymphatic hydrops.

Tzu-Jui Lien¹, Chun-Nan Chen¹, Yu-Fen Wang²

¹Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan.

Acta Oto-Laryngologica

|November 27, 2025

Summary

Endolymphatic hydrops (EH) can cause profound sensorineural hearing loss (SNHL). This may occur rapidly due to infection or develop slowly over years, indicating delayed EH.

Keywords:

Endolymphatic hydrops Hydrops MRI Meniere’s disease profound sensorineural hearing loss

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Area of Science:

Otolaryngology
Audiology
Radiology

Background:

Endolymphatic hydrops (EH) is increasingly identified via Hydrops MRI in patients with profound sensorineural hearing loss (SNHL).
This finding presents a discrepancy requiring investigation into the underlying mechanisms of SNHL in these cases.

Purpose of the Study:

To investigate the mechanisms behind profound SNHL in patients diagnosed with endolymphatic hydrops (EH).

Main Methods:

Evaluated 184 patients with Hydrops MRI, identifying 6 (3%) with profound SNHL.
Conducted comprehensive inner ear testing followed by Hydrops MRI for all affected patients.
Assessed the prevalence of EH in the cochlea and vestibule.

Main Results:

EH was present in the cochlea (67%) and vestibule (42%) of affected ears.
50% of patients experienced rapid SNHL onset (1-2 months) in both ears, linked to superimposed infections.
The other 50% showed a delayed SNHL onset (5-8 years), attributed to the progression of EH.

Conclusions:

Profound SNHL in EH ears suggests two pathways: superimposed infection on pre-existing hydrops or delayed EH development.
Rapid onset implies infection exacerbating existing hydrops, while gradual onset indicates a slower progression of EH.