The clinical and radiological findings of a giant cystic intraspinal c
ervical tumour are presented. Symptoms and signs suggesting a polyneur
opathy were misleading. On myelography the tumour appeared as a solid
mass, but its size was distincly underestimated. MRI demonstrated the
true extent (from C4 to T4) and the cystic structure of the tumour. Th
e histologpathological diagnosis was fibrillary neuroma (WHO grade I).