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AJNR - American Journal of Neuroradiology

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Isolated Absence of the Optic Chiasm: A Rare Cause of Congenital Nystagmus

T.J. Biega^a, Z.P. Khademian^b and G. Vezina^b

^a Department of Neuroradiology, George Washington University Medical Center, Washington, DC
^b Department of Radiology, Children’s National Medical Center, Washington, DC

View larger version (102K): [in this window] [in a new window]   Fig 1. A, Midline sagittal T1-weighted image demonstrates absence of the optic chiasm (arrow). The globes, optic nerves, and optic tracts are intact, but the optic chiasm is not present. B, Axial T2-weighted image at the level of the suprasellar cistern confirms absence of the optic chiasm (arrow).

View larger version (100K): [in this window] [in a new window]   Fig 2. A, Midline sagittal T1-weighted image demonstrates the absent optic chiasm (arrow). The remaining midline structures are unremarkable. B, Coronal T2-weighted image at the expected level of the optic chiasm demonstrates the optic nerves (arrows) lateral to the pituitary infundibulum. The optic nerves enter directly into the optic tracts without crossing at the chiasm.