Koos grading scale

Last revised by Yuranga Weerakkody on 23 Nov 2022

Citation, DOI, disclosures and article data

Citation:

Veiga M, Weerakkody Y, Smith D, et al. Koos grading scale. Reference article, Radiopaedia.org (Accessed on 18 Apr 2024) https://doi.org/10.53347/rID-83896

DOI:

https://doi.org/10.53347/rID-83896

Permalink:

https://radiopaedia.org/articles/83896

rID:

83896

Article created:

7 Nov 2020, Marcos Gil Alberto da Veiga ◉

Disclosures:

At the time the article was created Marcos Gil Alberto da Veiga had no recorded disclosures.

View Marcos Gil Alberto da Veiga's current disclosures

Last revised:

23 Nov 2022, Yuranga Weerakkody ◉

Disclosures:

At the time the article was last revised Yuranga Weerakkody had no financial relationships to ineligible companies to disclose.

View Yuranga Weerakkody's current disclosures

Revisions:

6 times, by 5 contributors - see full revision history and disclosures

Systems:

Central Nervous System

Sections:

Classifications

Tags:

vestibular schwannoma

Synonyms:

Koos grading system
Koos grading scale - vestibular schwannoma

The Koos grading scale ¹ is frequently used as a classification system for vestibular schwannomas.

Classification

grade 1: small intracanalicular tumour
grade 2: small tumour with protrusion into the cerebellopontine cistern (CPA); no contact with the brainstem
grade 3: tumour occupying the cerebellopontine cistern with no brainstem displacement
grade 4: large tumour with brainstem and cranial nerve displacement