The subject of chronic subdural hematoma has been presented in an excellent manner in recent years by several writers (Putnam and Cushing,1 Rand,2 Grant,3 Holmes,4 Brodie,5 Sherwood,6 Jelsma7 and Dandy8), and this clinical entity is well known. The object in this paper is to contribute some observations on the source of the bleeding from the cerebral veins which cross the subdural space to enter the superior longitudinal sinus, and to add the reports of five cases in which drainage through a trephine opening was used in treatment.
The primary etiologic factor of chronic subdural hematoma is now generally recognized to be trauma to the head and the source of the bleeding, venous. The character of the injury to the head, however, is often so mild as to escape even the notice of the patient, particularly since symptoms of compression of the brain