Cystic Meningioma Classification

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It's worth noting that the classification of cystic meningiomas is not always straightforward, and there can be some variation in how different experts classify these tumors.

Nauta et al. divided cystic meningiomas into four subtypes according to the location of the cyst with respect to the brain and meningioma ¹⁾.

type 1: intratumoral cyst(s), located centrally within the meningioma

type 2: intratumoral cyst(s), situated peripherally within the meningioma but still surrounded by tumour

type 3: cyst(s) located within the adjacent brain

type 4: cyst(s) located between the meningioma and brain (arachnoid cyst)

Worthington et al. later modified in 1985 the classification, which is the most widely used classification. ²⁾

type 1: intratumoral cyst(s), located centrally within the meningioma

type 2: intratumoral cyst(s), situated peripherally within the meningioma but still surrounded by tumor

type 3: cyst wall may contain a nest of tumor cells.

type 4: cyst(s) located within the adjacent brain

type 5: cyst(s) located between the meningioma and brain (arachnoid cyst)

4th type is most common.