3-year-old child. 3 weeks’ history of increasing vomiting and headache. The CT shows a 3 cm large round tumour in the cerebellar vermis.
- An extraordinary cell-rich, isomorphous, round and blue celled tumour with diffuse infiltration of the cerebellum.
- The tumour also infiltrates the subarachnoid space.
- Occasional neuroblastic rosettes
- Numerous mitoses
- Predominantly solid growth
- Tumour necrosis
WHO grade IV