The presence of intracerebral calculi, demonstrated by the roentgen rays as unchanging in size, situation and consistency during twelve years' observation, presented a problem for diagnosis in a patient who was suspected, owing to the position of these calculi, of having an intraventricular tumor. Although calcification of one sort or another is commonly seen in tumors, similar examples of "brain stones" had not been observed in this clinic. In this case the question arose as to whether the lesions represented calcification in a granuloma, a hematoma, in areas of degeneration or in a blood vessel abnormality, or two calcified endotheliomas in the right choroid plexus. From their position the last was the favored diagnosis. As no exploratory operative procedure was carried out in this clinic the answer to the foregoing questions would have remained unknown had not death occurred suddenly and unexpectedly while the patient was at home. The opportunity