Spinal dermoid tumours.

The present work is a detailed analysis of 12 cases of spinal dermoid tumours operated on between 1935 and 1976. Of these 11 were medullary (3 intramedullary and 8 subdural extramedullary), representing an incidence of 0-80% of medullary tumours, and 1 was an extraspinal coccygeal tumour. Most of the tumours were located in the spinal canal and conus. Good results were obtained following total ablation in 7 cases and partial removal of the tumour in 5 cases.