RECENTLY Lowman and von Storch (4) have called attention to the displacement of the calcified choroidal plexus of one of the lateral ventricles in a case believed to be due to hemorrhage into the left temporal fossa, secondary to rupture of a left carotid aneurysm. Undoubtedly, roentgenologists for years have thought of this type of displacement as a possible means for localizing brain tumor, but it is a salient fact that in searching for the displacement, it has seldom been found. The recent literature shows practically no papers devoted to this subject (except for the single reference above), though papers are quite numerous dealing with intracranial calcification (1, 2, 3, 5, 6, and 7). In recent years, during which this displacement has been diligently sought for, we have had our efforts rewarded by detection of five cases of space-occupying masses of this kind.1 In all of these, with one exception (this patient refused all operative procedures and was discharged against advice), the presence of a large intracerebral mass was verified by ventriculography, operation, or autopsy. Case 1. 132,606. H. E. L. Left posterior cerebral tumor in a male subject 44 years of age. Indefinite localizing signs. Displacement of pineal gland to the right of the midline. Displacement of left choroid plexus upward and medially. Verification of massive tumor by ventriculography. Refusal of further operative procedures with death supervening at home 13 months later. A male, 44 years of age, entered Strong Memorial Hospital Sept. 27, 1937, complaining of vomiting, frontal headache, and convulsions. Examination revealed aphasia, chiefly motor in type, absence of cranial palsies, and an accentuated right Achilles reflex. The spinal fluid was found under increased pressure on lumbar puncture (275 mm. H2O) showing increased globulin content and increased cellular content (112 lymphocytes). Skull films showed a calcified pineal with a definite shift to the right of the midline and a calcified choroid plexus of the left lateral ventricle which was displaced upward approximately one centimeter and somewhat crowded toward the midline. The plexus of the right lateral ventricle was calcified and showed a slight amount of lateral displacement. Other features of the skull were without interest, except for the finding of a moderate diastasis of the lambdoidal suture. Our impression was summarized as follows: “The position of the pineal gland and of the left choroidal plexus gives localizing information of value … suggesting a space-occupying mass in the posterior portion of the left cerebrum.” (Fig. 1.) A ventriculogram confirmed the shifting of the lateral ventricles to the right, the third ventricle being tilted toward this side in its upper portion.