TUMORS of the brain, while less common in children than in adults, are among the commonest tumors of childhood. Attention was first called to their peculiarities by Cushing1, in a memorable paper entitled "The Intracranial Tumors of Preadolescence," in 1927. With Bailey, he established most of the diagnostic categories recognized today, and later work has added little to the masterly accounts of each type as given by him and his pupils. The subject has recently been restudied in a valuable book by Bailey, Buchanan and Bucy2 entitled "Intracranial Tumors of Infancy and Childhood." I must acknowledge my indebtedness to both these sources.
While brain tumors include many pathologic types and are found in diverse locations, certain groups of symptoms are encountered in the majority of cases. Tumors of the brain are by definition expanding lesions, and, sooner or later, most of them produce an increase in the intracranial