Abstract
There is a tumor of the orbit arising from the frontal bone which has the following characteristics: (1) formation of the tumor below the upper bony margin of the orbit causing exophthalmos; (2) a lesion of the frontal bone showing as a defect of the bone in the roentgenograms, not connected with the nasal sinuses; (3) certain histologic peculiarities; (4) slow growth; (5) benignancy, cured by operation, with no tendency to recurrence and no influence on the patient's health. The two following cases illustrate this condition. REPORT OF CASES Case1.—History.—M. S., a man, aged 43, came to the Herman Knapp Memorial Eye Hospital on Dec. 6, 1932, complaining that the left eye had protruded and that the vision in that eye had been failing for three months. There were no headache or nasal discharge and no general symptoms. A firm mass like bone could be

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