Acoustic neuroma classification/staging: Difference between revisions
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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. | '''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 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. | '''Tumour size stage C:''' The tumour has made contact with the brainstem and is bigger than 25 mm. | ||
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'''T1: '''clear intrameatal tumour (in the bony ear canal) | '''T1: '''clear intrameatal tumour (in the bony ear canal) | ||
'''T2: '''intra and extrameatal tumour part (within and outside of 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) | '''T3a:''' Tumour fills the cerebellopontine cistern (between the cerebellum and brainstem) | ||
'''T3b:''' Tumour reaches the brainstem | '''T3b:''' Tumour reaches the brainstem | ||
'''T4: '''Tumour compromises the brainstem | '''T4: '''Tumour compromises the brainstem | ||
<ref> http://www.acoustic-neuroma-brain-tumour.org/english/acoustic-neuroma-diagnosis.php </ref> | '''T4b:''' Tumour compromises the brainstem and displaces the four ventricles (cerebral ventricle)<ref> http://www.acoustic-neuroma-brain-tumour.org/english/acoustic-neuroma-diagnosis.php </ref> | ||
Revision as of 10:01, 21 April 2012
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)[1]