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Dr. KERR LOVE said that there were cases in which mastoiditis seemed to have converted a large pneumatic mastoid into a process in which it was difficult to find the antrum at all. That might have been due, in some of the cases, to imperfect surgical technique, as in discovering a very small antrum. His belief was that the mastoid antruin was present in every case, though he had met with cases in which he could find nothing but a single cell. That was before he radiographed the mastoid process-in the bone itself, not in the patient. When he found that the mastoid process, in practically every case in which he did this, was almost entirely composed of cells, he became very doubtful with regard to this process of conversion of a pneumatic process into an almost solid mastoid process. The present demonstration seemed to show how it came about, and the question was whether it was as rare as the President said, and whether it might not be the result of disease.

A Case of Spherical Bulging of the Floor of the Third Ventricle, Secondary to Internal Hydrocephalus and Simulating a Pituitary Tumour