Incipient Prechiasmal Optic Nerve Compression Syndrome
General: Caused by an expansive prechiasmal tumor 121j98b or other lesion slowly compressing the optic nerve; frequently unilateral.
Ocular: Gradually progressive dimming of vision with near-normal acuity; reduced color perception (dyschromatopsia); subtle monocular field defects (progressive); positive Marcus Gunn pupillary sign (afferent pupillary light defect); optic nerve atrophy, depending on duration of compression before removal of the lesion; central or hemicentral scotoma.
Gittinger JW Jr. Chiasmal disorders. In: Albert DM, Jakobiec FA, eds. Principles and Practice of Ophthalmology, vol. IV. Philadelphia: WB Saunders, 1994:2615-2629.
Hollenhrost RW, Younge BR. Ocular manifestations produced by adenomas of the pituitary gland: analysis of 1000 cases. In: Tumors. Amsterdam: Excerpta Medica, 1973:53.
Jane JA, McKissock W Importance of failing vision in the early diagnosis of suprasellar meningioma. Br Med J 1962; 2:5.
Knight CL, et al. Syndrome of incipient prechiasmal optic nerve compression. Arch Ophthalmol 1972; 87:1.
Potter GD, Trokel SL. Anatomic and radiographic analysis of the optic canal and orbital apex. Arch Ophthalmol 1970; 83:584.
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