The opinion is often expressed that massive hemorrhage into a brain tumor is responsible for an abrupt change in the intracranial contents resulting in a rapidly fatal termination. It is also postulated, and often claimed, that such massive hemorrhage into a brain tumor may be caused by violence to the head. We are unaware of any satisfactory proof, which is based on a sufficiently representative number of verified cases of brain tumor, that has yet been offered to support these two views. Moreover, the large material of Cushing, which was analyzed by Oldberg,1led the latter toconclude that hemorrhage into brain tumor plays an unimportant role in the clinical picture, while elsewhere we2have corroborated the observations of Kernohan and Parker3that the causative relationship between trauma and brain tumor in general has been overemphasized if it exists at all. With this in mind, we undertook