====== Olfactory groove meningioma classification ======

===== Latest Pubmed Related Articles =====

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see also [[Anterior skull base meningioma classification]]
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The classification includes:

Small [[Olfactory groove meningioma]] (0–2 cm in diameter)

Medium (2–4 cm diameter) 

Large (4–6 cm diameter)

[[Giant Olfactory Groove Meningioma]] (>6 cm in diameter).
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The extent of perilesional edema was assessed by evaluation of axial fluid-attenuated inversion recovery (FLAIR) MRI and scored using a devised system. Perilesional edema scores of 3 and 4 corresponded to a characteristic radiological appearance of edema, which we term the ‘ sabre-tooth ’ sign due to its triangular shape

{{::sabretooth.jpg?200|}}

Score Description of perilesional oedema
0 no edema

1 edema involving less than half of frontal white matter

2 edema confined to but involving more than half of frontal
white matter

3 edema entering into lateral white matter tracts of external
capsule

4 edema extending posteriorly within the external capsule
((Mukherjee S, Thakur B, Corns R, Connor S, Bhangoo R, Ashkan K, Gullan R.
Resection of olfactory groove meningioma - a review of complications and
prognostic factors. Br J Neurosurg. 2015 Jul 15:1-8. [Epub ahead of print] PubMed
PMID: 26174632.)).