posterior_fossa_meningioma_classification

Posterior fossa meningioma classification

There are various other classification systems for posterior fossa meningiomas.

Sekhar and Wright Classification of posterior fossa meningiomas 1)

Type

I Cerebellar convexity meningioma lateral tentorial Extension Tentorium, transverse, sigmoid sinuses

II Cerebellopontine angle meningioma - Petrous ridge, IAC

III Jugular foramen meningioma - Cerebellomedullary angle, internal jugular vein, extracranial

IV Petroclival meningioma - Upper 2/3 clivus, cavernous sinus, Meckel's cave, petrous ridge

V Foramen magnum meningioma - Lower 1/3 clivus, C1_ 2 area

VI Unclassified - Entire clivus, mid and lower clivus, other types

These six different subtypes of posterior fossa meningiomas differ in their localization, natural history, required surgical technique, and outcome. These subtypes include cerebellar convexity, cerebellopontine angle, petroclival, tentorial, foramen magnum, and jugular foramen meningiomas.

Bradac et al 2) subdivided posterior fossa meningiomas into four groups:

1. Tentorial meningiomas are those located under the surface of the tentorium cerebelli;

2. Clival meningiomas proceed from upper third of the clivus bone in the direction of the middle cranial fossa or the direction of the brainstem;

3. Cerebellopontine angle meningioma arise from the medial portion of the petrous bone;

4. Foramen magnum meningiomas arise at or near the anterior rim of the foramen

Castellano and Ruggeiro 3) had classified posterior fossa meningiomas into:

Tentorial meningioma

Petroclival meningioma

Cerebellar convexity meningioma

Posterior surface of the petrous bone (see Cerebellopontine angle meningioma).

Clivus meningioma

Foramen magnum meningioma.


1)
Sekhar LN, Wright DC, Richardson R, Monacci W. Petroclival and foramen magnum meningiomas: surgical approaches and pitfalls. J Neurooncol. 1996 Sep;29(3):249-59. Review. PubMed PMID: 8858531.
2)
Bradac GB, Ferszt R, Kendall BE, Cranial meningiomas. Diagnosis, Biology, Therapy. SpringerVerlag, Berlin, 1990, p. 125.
3)
Castellano F, Ruggiero G. Meningiomas of the posterior fossa. Acta Radiol Suppl. 1953;104:1–177.
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