Photos 3 and 4 show architecture suggestive of chordoid meningioma (WHO grade II). Many cells have rhabdoid appearance, but I am not certain these are sufficient for the diagnosis of WHO grade III rhabdoid meningioma. How often do you find mitotic figures? Mitotic count, in general and as a rule, is a very good creterion for grading meningiomas.
Photos 3 and 4 show architecture suggestive of chordoid meningioma (WHO grade II). Many cells have rhabdoid appearance, but I am not certain these are sufficient for the diagnosis of WHO grade III rhabdoid meningioma. How often do you find mitotic figures? Mitotic count, in general and as a rule, is a very good creterion for grading meningiomas.