Acoustic Neuroma Flashcards

1
Q

What is the definition of acoustic neuroma?

A

Rare, benign tumour of CN VIII sheath that arises in internal auditory meatus.

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2
Q

What are some risk factors for acoustic neuroma?

A

May be associated with extensive exposure to loud noise
Neurofibromatosis type 2 (if bilateral and young)

(however 95% are sporadic and unilateral)

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3
Q

What is the pathophysiology of acoustic neuroma?

A

Associated with vestibular portion of CN VIII and occurs within temporal bone
Represent 80-90% of cerebellopontine angle tumours

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4
Q

What is the gross appearance of acoustic neuroma?

A

Circumscribed tan/white/yellow mass

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5
Q

What is the histological appearance of acoustic neuroma?

A

Encapsulated
Two growth patterns (Antoni A and Antoni B)

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6
Q

What are some clinical features of acoustic neuroma?

A

Progressive sensorineural unilateral hearing loss and tinnitus
Imbalance in larger tumours
Facial numbness due to compression of trigeminal nerve as tumour enlarges

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7
Q

What are some investigations for acoustic neuroma?

A

MRI

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8
Q

What is the management of acoustic neuroma?

A

Surgical excision (definitive)
Monitoring with MRI at 6 month interval for small lesions that are not growing

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