Since the time of the earliest electron microscopic studies on tumours of the human nervous system. undertaken over 20 years ago by Luse and her colleagues. there have been considerable advances in our understanding of these neoplasms. Tissue culture and specific antibodies to tumour antigens are two of the techniques which have greatly aided such advances. enabling much to be learned about the biological properties and underly ing nature of all types of nervous system tumour. Electron microscopy. however. has continued to prove of considerable value in the investigation of these tumours. and...