CNS meningioma

Meningioma

Microscopic descriptions:

- Tumor histology and immunohistochemical studies:

- Histological type (WHO 2016):
- WHO Grade:
- Mitotic count (adjusted for Nikon 22 mm eyepiece):
- Brain invasion:
- Anaplasia (sarcoma, carcinoma, or melanoma-like histology):

- Atypical features:

- at least 3 out of 5 required for diagnosis of "atypical meningioma"

- Increased cellularity:
- Patternless growth:
- Increased nuclear to cytoplasmic ratio (small cell change):
- Prominent nucleoli:
- Necrosis:

- Additional notes: