anaplastic cancer grade III meningioma anaplastic meningioma ONCOTREE:ANM NCIT:C4051 MONDO:0020635 anaplastic meningioma GARD:0025191 MEDGEN:75478 anaplastic (malignant) meningioma UMLS:C0259785 A WHO grade III meningioma characterized by the presence of malignant morphologic features, including malignant cytology and a very high mitotic index (20 or more mitoses per ten high power fields). meningioma, anaplastic, malignant ICDO:9530/3 malignant meningioma high grade malignant neoplasm malignant tumor of meninges