Acoustic neuroma classification/staging: Difference between revisions
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'''T4: '''Tumour compromises the brainstem | '''T4: '''Tumour compromises the brainstem | ||
'''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> | '''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 10:03, 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]