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| __NOTOC__
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| {{Acoustic neuroma}}
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| {{CMG}}
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| ==Overview==
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| Acoustic neuroma may be classified into three subtypes based on tumor size and into six subtypes based on tumor location.
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| ==Staging==
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| Acoustic neuroma may be classified into three subtypes based on tumor size and into six subtypes based on tumor location.
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| '''WIGAND''' has defined a trinomial classification:
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| '''Tumour size stage A: '''The tumor 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 tumor has spread up to the cerebellopontine angle and is 9-25 mm in size.
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| '''Tumour size stage C:''' The tumor has spread to the brainstem and is bigger than 25 mm.
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| {| style="border: 0px; font-size: 90%; margin: 3px; width: 600px" align=center
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| |valign=top|
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| ! style="background: #4479BA; width: 200px;" | {{fontcolor|#FFF|Stage}}
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| ! style="background: #4479BA; width: 400px;" | {{fontcolor|#FFF|Tumor size}}
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| ! style="background: #4479BA; width: 400px;" | {{fontcolor|#FFF|Tumor location}}
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| | style="padding: 5px 5px; background: #DCDCDC; font-weight: bold" |
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| :Stage A
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| | style="padding: 5px 5px; background: #F5F5F5;" |1-8 mm in size
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| | style="padding: 5px 5px; background: #F5F5F5;" |The tumor is limited to the inner auditory passage
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| |-
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| | style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" |
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| :Stage B
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| | style="padding: 5px 5px; background: #F5F5F5;" |9-25 mm in size
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| | style="padding: 5px 5px; background: #F5F5F5;" |The tumor has spread up to the cerebellopontine angle
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| |-
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| | style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" |
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| :Stage C
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| | style="padding: 5px 5px; background: #F5F5F5;" |Greater than 25 mm in size
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| | style="padding: 5px 5px; background: #F5F5F5;" |The tumor has spread to the brainstem
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| |-
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| |}
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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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| {| style="border: 0px; font-size: 90%; margin: 3px; width: 600px" align=center
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| |valign=top|
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| ! style="background: #4479BA; width: 200px;" | {{fontcolor|#FFF|Stage}}
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| ! style="background: #4479BA; width: 400px;" | {{fontcolor|#FFF|Tumor location}}
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| | style="padding: 5px 5px; background: #DCDCDC; font-weight: bold" |
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| :T1
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| | style="padding: 5px 5px; background: #F5F5F5;" |Clear intrameatal tumour (in the bony ear canal)
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| | style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" |
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| :T2
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| | style="padding: 5px 5px; background: #F5F5F5;" |Intra and extrameatal tumour part (within and outside of the bony ear canal)
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| |-
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| | style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" |
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| :T3a
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| | style="padding: 5px 5px; background: #F5F5F5;" |Tumor fills the cerebellopontine cistern (between the cerebellum and brainstem)
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| |-
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| | style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" |
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| :T3b
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| | style="padding: 5px 5px; background: #F5F5F5;" |Tumor reaches the brainstem
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| |-
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| | style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" |
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| :T4a
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| | style="padding: 5px 5px; background: #F5F5F5;" |Tumor compromises the brainstem
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| |-
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| | style="padding: 5px 5px; background: #DCDCDC;font-weight: bold" |
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| :T4b
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| | style="padding: 5px 5px; background: #F5F5F5;" |Tumor compromises the brainstem and displaces the four ventricles (cerebral ventricle)
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| |-
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| |}
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