To one who has seen only two instances of tuberculoma of the brain during two and one-half years' association with a clinic in which neurologic surgery for patients of all ages plays an important part, the traditional estimate that the majority of all intracranial growths are granulomas and approximately half of them tuberculomas seems like a myth. Their apparent present-day rarity, in this country at least, is so striking when compared with the statements in textbooks and current literature that it warrants comment. Furthermore, the fact that the two patients referred to (cases 6 and 14) both succumbed ultimately to the disease has aroused curiosity as to whether the results of surgical intervention for tuberculomas of the brain have been as unfavorable in other hands as they have been in this clinic. Hence this study was undertaken a year ago at Dr. Cushing's suggestion, with a twofold purpose. INCIDENCE M.