Out of the chaos of all the so-called gliomas of the brain, Bailey and Cushing1 were able to make an orderly, workable classification by studying the predominating cell types of the various tumors and correlating them with a particular stage of histogenesis of adult nervous tissue. They were able to accomplish this feat by utilizing specific methods of impregnation with silver salts devised mainly by Cajal and Hortega. Such attempts, except in one instance, have as yet not been applied by ophthalmologists, yet the proper fixation of retinal and optic nerve tumors and the use of modern staining methods instead of celloidin hematoxylin-eosin preparations are essential to the advancement of knowledge concerning them.
However, although one must await further work to complete the knowledge of the probable glial tumors, the careful cellular studies already made enable one to classify the tumors described in the literature. Tumors of
GRINKER RR. TUMORS OF THE OPTIC NERVE. Arch Ophthalmol. 1930;4(4):497–508. doi:10.1001/archopht.1930.00810120057005
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