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| __NOTOC__
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| {{Acoustic neuroma}}
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| '''WIGAND''' has defined a trinomial classification:
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| '''Tumour size stage A: '''The tumour is limited to the inner auditory passage and is 1-8 mm (average diameter) in size.
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| '''Tumour size stage B:''' The tumour has spread up to the cerebellopontine angle and is 9-25 mm in size.
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| '''Tumour size stage C:''' The tumour has made contact with the brainstem and is bigger than 25 mm.
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| '''SAMII''' defines six tumour classes:
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| '''T1: '''clear intrameatal tumour (in the bony ear canal)
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| '''T2: '''intra and extrameatal tumour part (within and outside of the bony ear canal)
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| '''T3a:''' Tumour fills the cerebellopontine cistern (between the cerebellum and brainstem)
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| '''T3b:''' Tumour reaches the brainstem
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| '''T4: '''Tumour compromises the brainstem
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| '''T4b:''' Tumour compromises the brainstem and displaces the four ventricles (cerebral ventricle)
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