Tumors of the optic disc are extremely rare. Up to the present only about 30 cases have been published, a few with microscopic study. If we subtract from this number those which originate from the surrounding tissue, i. e., malignant melanomas of the choroid, retinoblastomas of the retina, and metastatic tumors, which are likewise very rare, then the remaining number of tumors of the optic disc is considerably smaller. Among the latter pigmented tumors, neural tumors and tumors in phacomatosis have been described.
In the present paper we are chiefly interested in pigmented tumors of the optic disc. Up to the present only 10 of these have been described, and each one was reported as a primary tumor of the optic disc (Murray, Vasquez-Barrière, Oloff, Cosmetatos, Speciale-Cirincione, Oguchi, Levine, Bucalossi, Fry and Delong, Cordes and Hogan).
The various authors differ considerably in their estimation and consideration of these cases as
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