Acoustic neuroma staging
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Acoustic neuroma Microchapters | |
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Risk calculators and risk factors for Acoustic neuroma staging | |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Acoustic neuroma may be classified into three subtypes based on tumor size and into six subtypes based on tumor location.
Staging
Acoustic neuroma may be classified into three subtypes based on tumor size and into six subtypes based on tumor location.
WIGAND has defined a trinomial classification:
Tumour size stage A: The tumour is limited to the inner auditory passage and is 1-8 mm (average diameter) in size.
Tumour size stage B: The tumour has spread up to the cerebellopontine angle and is 9-25 mm in size.
Tumour size stage C: The tumour has made contact with the brainstem and is bigger than 25 mm.
SAMII defines six tumour classes:
T1: clear intrameatal tumour (in the bony ear canal)
T2: intra and extrameatal tumour part (within and outside of the bony ear canal)
T3a: Tumour fills the cerebellopontine cistern (between the cerebellum and brainstem)
T3b: Tumour reaches the brainstem
T4: Tumour compromises the brainstem
T4b: Tumour compromises the brainstem and displaces the four ventricles (cerebral ventricle)