Atypical Meningioma – Mitoses and Macronucleoli

The vast majority of meningiomas are benign grade I tumors.  Meningiomas can be upgraded to grade II, called atypical meningiomas, if they show increased mitotic activity (4 or more mitoses in 10 high power fields) or other worrisome histopathologic features, such as tumor cells exhibiting a prominent and large nucleolus.  Notice the mitosis in the center-right of the image and... Continue Reading →

Giant Cell Glioblastoma and Granular Mitoses

Giant Cell Glioblastoma, also called magnocellular or monstrocellular glioblastoma, is characterized by atypical cells that are extremely large, especially when compared to the non-neoplastic inflammatory cells seen on the left side of the image.  The tumor has increased number of dividing cells, including typical mitotic figures (bottom left arrow) and atypical or granular mitoses (bottom... Continue Reading →

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