Related Experiment Video
Updated: Jun 29, 2026

Surgical Treatment of an Endolymphatic Sac Tumor
Published on: May 26, 2023
An uncommon presentation of an VIII nerve tumor
Rubem Cruz Swensson1, Rogério Poli Swensson, Fabio Eduardo Caramante Pizzini
1Discipline of Otorhinolaryngology, Faculdade de Medicina de Sorocaba, PUC-SP.
Abstract:
Vestibular Shwannomas are responsible for 80-90% of the cerebelar-pontine angle tumors and their incidence is of 0.8 to 20.5% of all tumors. Unilateral and progressive hearing loss is the most frequent and premature symptom, and tinnitus is the second most common complaint. Only 5% of the patients have normal audiograms. In this case the patient complained of ipsilateral facial numbness and weak blink, posterior pinna hypoesthesia (Hitzelberger +), tear reduction and positive Romberg test. He also had mouth twisting but no other involvement of other cranial nerves. Hearing acuity was normal.
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