Abstract
In the eagerness to find some focus of infection to explain the etiology of retrobulbar neuritis, the possibility that a malignant tumor may originate within or adjacent to the sphenoid should not be overlooked. I found two such cases of involvement of the optic nerve in a series of 125 cases of retrobulbar neuritis. While these growths are fortunately infrequent, I believe that a review of their salient points may be of sufficient interest to warrant presentation. The first case was seen so late that there was little question as to the diagnosis, while the second came under observation before the changes were marked enough to show on a roentgenogram, so that the diagnosis was made only a short time before death. REPORT OF CASES CASE 1.—R. M., a man, aged 45, was referred on April 18, 1918, by Dr. William J. Daly, with a diagnosis of axial neuritis

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