====== Cavernous Sinus Meningioma Classification ======
Hirsh et al. categorized [[cavernous sinus meningioma]] into three groups based on their relationship to the cavernous carotid to predict the difficulty of resection
((Hirsch WL, Sekhar LN, Lanzino G, Pomonis S, Sen CN. Meningiomas involving the cavernous sinus: value of imaging for predicting surgical complications. AJR Am J Roentgenol. 1993 May;160(5):1083-8. doi: 10.2214/ajr.160.5.8470581. PMID: 8470581.)).
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Sekhar’s Classification

Grade I— tumors involve 1 region of the sinus & do not invoke the ICA 

Grade II—tumors occupy multiple regions of the sinus & displace but do not encase the ICA 

Grade III—tumors encase the ICA w/o narrowing 

Grade IV—tumors encase & narrow the ICA 

Grade V—tumors involve both CSs & encase the ICA 

Sphenocavernous, clinoidocavernous, and sphenoclinoidocavernous meningiomas
(()).
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DeMonte’s grading of tumour resection

Grade Definition

I Complete removal of tumour and dural attachment with any
abnormal bone

II Complete removal of tumour and coagulation of its dural
attachment

IIIa Complete removal of intra- and extradural tumour without
resection or coagulation of its dural attachment

IIIb Complete removal of intradural tumour without resection or
coagulation of its dural attachment or any extradural
tumour extensions

IVa Intentional subtotal removal to preserve cranial nerve or
blood vessels with complete removal of its dural attachment

IVb Subtotal removal leaving <10% tumour volume
V Subtotal removal leaving >10% tumour volume or
decompression with or without biopsy
((DeMonte F, Smith H, Al-Mefty O (1994) Outcome of aggressive removal of cavernous sinus meningiomas. J Neurosurg 81:245–251 )).