Solid pseudopapillary tumours consist of solid sheets of cells that are focally dyscohesive. They may represent a focally degenerative bit of myelin. The sustentacular cells are S-100 positive and focally positive for glial fibrillary acidic protein. Microscopic necrosis can be seen focally in MTSCC. Adenomyosis may involve the uterus focally, creating an adenomyoma. The fascicular arrangement of the tumour can be observed focally.