In evaluating a 3-month-old boy with horizontal nystagmus, brain MRI revealed absence of the optic chiasm. The remainder of the brain was normal in appearance. Achiasma was confirmed with diffusion tensor imaging and best visualized with optimized probabilistic-based tractography.
Department of Radiology (AL), Fondation Ophtalmologique Rothschild, Paris, France; Department of Neuroradiology (AA), CHU Grenoble, Paris, France; and Department of Ophthalmology (CE), Fondation Ophtalmologique Rothschild, Paris, France.
Address correspondence to Augustin Lecler, MD, MSc, Department of Radiology, Fondation Ophtalmologique Adolphe de Rothschild, 25 rue Manin, 75019 Paris, France; E-mail: firstname.lastname@example.org
The authors report no conflicts of interest.