Petrous Meningiomas II: Ventral, Posterior and Superior Subtypes

Despite the relatively small size of the petrous bone, menin-giomas arising from this region constitute a heterogeneous group of tumors in regards to surgical considerations, operative risks, outcome, and tumor histology. In the literature, there is a lack of standardized terminology for meningiomas arising from the posterior surface of the petrous bone. For instance, some authors include all menin-giomas arising from the posterior surface of the petrous bone in their definition of “posterior petrous meningiomas”.^1,2 Others prefer the term “cerebellopontine angle meningioma” for the same group of tumors.^3–5 The term “Petrous pyramid” meningiomas has also been used. Sekhar has classified posterior fossa meningiomas into five groups, and according to this classification, some of Type II, III, and IV meningiomas can be referred to as petrous meningiomas.⁶