Acoustic neuroma staging

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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:
Stage Tumor size Tumor location
Stage A
1-8 mm in size The tumor is limited to the inner auditory passage
Stage B
9-25 mm in size The tumor has spread up to the cerebellopontine angle
Stage C
Greater than 25 mm in size The tumor has spread to the brainstem

SAMII defines six tumour classes:

Stage Tumor location
T1
Clear intrameatal tumour (in the bony ear canal)
T2
Intra and extrameatal tumour part (within and outside of the bony ear canal)
T3a
Tumor fills the cerebellopontine cistern (between the cerebellum and brainstem)
T3b
Tumor reaches the brainstem
T4a
Tumor compromises the brainstem
T4b
Tumor compromises the brainstem and displaces the four ventricles (cerebral ventricle)

References


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