The procedure of encephalography as a diagnostic and therapeutic agent has become more popular in the past few years. As in all new ventures in medicine and surgery, extravagant claims have been made for the relative merits for this addition to our armamentarium. There is no question but that encephalography has been of distinct advantage in certain conditions and guilty of providing misleading or worthless clues in pursuing the cause of other disease entities: Thus, it is the purpose of this paper to present a critical review of a series of cases, taken in consecutive order, and to discuss the relative merits of encephalography in each individual instance. It seems unnecessary to repeat the history of the development of this procedure, with its gradual evolution into the present technic, which is practically standardized. Thus, each type of disease condition in which the following cases have been applied will be briefly discussed. Brain Tumors.—There are certain instances in which the presence of an intracranial growth is suspected, with a paucity of localizing signs. No case of suspected brain tumor should be submitted to a mechanical means of diagnosis until every neurologic, opthalmologic, and roentgenographic clue has been carefully investigated. There are, however, instances in which further efforts are indicated so that a proper diagnosis and localization can be made. It has been emphasized repeatedly that encephalography is dangerous in the presence of increased intracranial pressure as evidenced by choked discs and a high spinal manometric reading. Thus, encephalography is of value in cases of suspected tumor in which the signs of pressure are absent. It is necessary, however, at times to supplement ventriculography when the encephalographic findings are not conclusive, as stressed by Dandy and illustrated in three of the following cases. Adson presented an excellent evaluation of this procedure in 1931 and I am taking the liberty to borrow his means of critical analysis. The above ten cases had variable signs and points in each history which would lead to a suspicion of brain tumor. In no case was there presence of choked discs or an increase of spinal fluid pressure above 20 cm. of water. Eight of the ten cases were explored and in six the encephalograms were found to have been of definite localizing value. In two instances (Cases 2 and 5) the localization was definitely misleading as no tumor was found. There was one instance (Case 8) in which the ventricles did not fill satisfactorily and subsequent ventriculography was necessary before a definite diagnosis could be made. The one death (Case 9) following encephalography was in a nine-year-old girl with a third ventricle tumor. The neurologic picture consisted of a child in coma who suffered from a bizarre type of convulsive seizures many times each day.
Read full abstract