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Lesions of the lateral geniculate body (LGB) are the most unusual lesions of the visual pathways. Imaging studies are very important in establishing the correct diagnosis. However, due to its small size and particular location, the lateral geniculate body and its lesions are sometimes difficult to detect in imaging studies possibly causing diagnostic confusion. The purpose of this paper is to document an unusual case of a lesion of the lateral geniculate body for which an optical coherence tomography study was very important in confirming the anatomic diagnosis of a lateral geniculate body lesion. A 39-year-old woman with a previous diagnosis of uveitis and central nervous system vasculitis was referred for investigation of a right temporal quadrantanopia. She had already been submitted to a magnetic resonance imaging (MRI) that did not show any lesion along the visual pathway. Ophthalmoscopy revealed retinal nerve fiber layer (RNFL) loss that was confirmed by optical coherence tomography. Such finding associated with the observations on the neurological examination strongly suggested a lateral geniculate body lesion. The patient was submitted to another new magnetic resonance imaging obtained with especially oriented thin sections and an ischemic lesion of the lateral geniculate body was observed establishing the correct diagnosis. This case serves to confirm the importance of optical coherence tomography in determining the pattern of retinal nerve fiber layer loss in neuro-ophthalmic diseases and therefore to help in locating a lesion along the visual pathway.

arquivos brasileiros de oftalmologia

Hemianopsia por lesão no corpo geniculado lateral. Importância diagnóstica da análise da camada de fibras nervosas pela tomografia por coerência óptica: relato de caso