60-year-old female. 2-year history of increasing hearing difficulty in one ear, clinically misdiagnosed as middle ear apoplexy. 3 months’ history of ataxia. The CT scan shows a walnut-sized tumour in the right cerebellum.
- The tumour is poor in cells but rich in fibrous tissue.
- The tumour cells appear thin, with bean- to cigar-shaped thin nuclei in a wave-like structure.
- Parts of the tumour consist of degenerative, loose myxoid tissue.
- Some cells have atypic nuclei. No necrosis. Low-grade vessel proliferation.
WHO grade I