Gliomas of the pons present an intriguing problem in diagnosis. They are readily confused with other processes, but if once suspected their diagnosis is in most cases not only possible but easy. Furthermore, their diffusely infiltrating nature gives rise to greatly varied clinical manifestations. It is primarily to define and clarify the clinical features of pontile gliomas, in order to indicate how the diagnosis is made, that 11 cases are recorded in this paper. Incidentally, mention will be made of bizarre clinical features arising from the method of growth of these tumors. Among all verified gliomas observed between 1929 and 1936 in the neurosurgical clinic of the University Hospital there were 15 infiltrating tumors of the pons. Only 11 of these were selected for study, since 4 have already been described as mesencephalic gliomas (Alpers and Watts1). These 4 tumors involved primarily the mesencephalon and secondarily the pons. The