Presentation of Ocular Syphilis with Bilateral Optic Neuropathy

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Abstract
A 60-year-old otherwise healthy male presented with a 1 year history of bilateral progressive visual loss. His best-corrected visual acuity was counting fingers at 2 m with his right eye and counting fingers at 0.5 m with his left eye. Visual field testing revealed bilateral near-total loss of visual fields. Slit-lamp examination was unremarkable, apart from bilateral grade two nuclear sclerotic cataracts. Both optic discs were pale-looking with some retinal pigment epithelial alterations at the left papillomacular region. Enhanced depth imaging optical coherence tomography depicted punctate hyperreflective dots at the inner choroidal level corresponding to the retinal pigment epithelial changes in the left eye. Fundus autofluorescence imaging revealed patchy hyper-autofluorescent and hypo-autofluorescent areas, and there was mild staining in the early and late phases of the fluorescein angiogram at the papillomacular region in the left eye. A diagnosis of bilateral optic neuropathy was made. A full systemic work-up was carried out, and serological tests pointed out the presence of syphilis with normal cranial magnetic resonance imaging. He was treated accordingly. Our case clearly demonstrates the importance of a high clinical suspicion for syphilis in cases of optic neuropathy.
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