The patient went on to have a laminectomy and excision of the larger tumour, for both diagnosis and symptomatic relief.
MICROSCOPIC DESCRIPTION: Paraffin sections show fragments of moderately cellular tumour comprising perivascular pseudorosettes and small clusters of mildly atypical cells embedded in a fibrillary matrix. There are mucin containing microcystic spaces surrounded by tumour cells. No mitoses are identified. There is no endothelial cell hyperplasia or necrosis. The features are of myxopapillary ependymoma. The Ki-67 proliferative index is less than 1%.
FINAL DIAGNOSIS: L2 intradural lesion: Myxopapillary ependymoma (WHO Grade I).