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We describe Magnetic Resonance Imaging (MRI) findings in a 49-years-old female who presented with subacute visual loss. MRI findings were suggestive of optic neuritis and chiasmal neuritis. She had necrotic mediastinal lymphadenopathy which was diagnosed as tuberculosis. Optic neuritis and chiasmal neuritis in this case were most probably due to hypersensitivity to mycobacterium. To the best of authors' knowledge, these unusual MRI findings of optic and chiasmal neuritis caused by hypersensitivity to mycobacterium have not been previously reported.