microcystic meningioma

microcystic meningioma

A World Health Organization grade-1 meningioma, the primary cell of which has round to ovoid, occasionally large and pleomorphic nuclei, pale eosinophilic cytoplasm, and numerous vacuoles to small cysts. There is no necrosis or brain invasion mitoses or hypercellularity. A second component of microcystic meningioma consists of numerous vessels that are small to medium sized, with some showing hyalinisation and thicker walls.
References in periodicals archive ?
The error was in misinterpreting microcystic meningioma (WHO grade I) as a malignant neoplasm or high-grade tumor, and misdiagnosing central neurocytoma (WHO grade II) as a low-grade glioma.
A case of microcystic meningioma (WHO grade I) was reported as a malignant neoplasm in FS [Figure 5 a and b].
3] Microcystic meningioma is named because of its microcystic appearance that occurs owing to the variable-sized intercellular vacuole.
According to the World Health Organization (WHO) grading, WHO grade 1 consists of 45 cases (90%), among them 32 cases were of meningothelial meningioma, 5 cases of psammomatous meningioma, 3 cases of fibroblastic meningioma, 4 cases of angiomatous meningioma, and 1 case of microcystic meningioma.