What are the symptoms of vestibular schwannoma?

Symptoms of Vestibular Schwannoma

The vast majority of patients with vestibular schwannoma present with unilateral sensorineural hearing loss (94%) and tinnitus (83%), while vestibular symptoms like vertigo and unsteadiness occur in 17-75% of patients. 1

Primary Clinical Manifestations

Auditory Symptoms (Most Common)

• Unilateral sensorineural hearing loss: Present in 94% of patients, this is the hallmark symptom 1
• Tinnitus: Occurs in 83% of patients 1
• These auditory symptoms typically develop gradually and progressively, though sudden hearing loss can occur 2

Vestibular Symptoms (Variable Presentation)

• Vertigo and unsteadiness: Reported in 17-75% of patients, though likely underreported 1
• Balance disturbances: Can manifest as recurrent falls, particularly in elderly patients where VS may be overlooked 3
• Dizziness: May be the presenting complaint, especially in atypical cases 2, 3

Symptoms from Large Tumors

When tumors grow beyond the internal auditory canal, additional symptoms emerge:

• Trigeminal neuropathy: Facial numbness or pain
• Facial nerve palsy: Weakness or paralysis of facial muscles
• Brainstem compression: Ataxia, coordination problems
• Hydrocephalus: Headache, altered consciousness 1

Important Clinical Considerations

Atypical Presentations

Be vigilant for atypical presentations that can delay diagnosis, including:

• Transient tinnitus without hearing loss 2
• Sudden hearing loss mimicking other otologic conditions 2
• Unilateral auditory neuropathy in young patients 2
• Isolated balance disturbances or recurrent falls in elderly patients 3
• Facial stiffness or aural fullness 2

Bilateral Presentation

Bilateral vestibular schwannomas are pathognomonic for neurofibromatosis type 2 (NF2), occurring in 4-6% of all VS cases 1. Consider NF2 when:

• Unilateral VS presents in patients <30 years old
• Any patient with bilateral VS
• Family history of NF2 with unilateral VS 1

Key Diagnostic Pitfall

Many patients with small, intracanalicular tumors may be nearly asymptomatic or have only minor symptoms 4. The increasing detection of smaller tumors on MRI means clinicians must maintain high suspicion even with subtle or atypical audiological findings 2, 5. Hearing loss can occur even in non-growing tumors, suggesting paracrine tumor activity rather than purely mechanical compression 6.

Symptom Progression Pattern

The typical progression follows this pattern:

1. Early: Unilateral hearing loss ± tinnitus
2. Intermediate: Addition of vestibular symptoms (vertigo, imbalance)
3. Late (large tumors): Cranial nerve palsies, brainstem signs, hydrocephalus

Any patient presenting with unilateral or asymmetric hearing loss should undergo detailed audiological evaluation and be considered for MRI to rule out vestibular schwannoma 5, 7, as early detection when tumors are small provides more treatment options and better functional outcomes.