[Ocular syphilis, a re-emergent pathology: Series of 12 patients in one Hospital, 2017]

Case report: Visual acuity loss as a warning sign of ocular syphilis: A retrospective analysis of 17 cases

Objectives

To define the clinical features of ocular syphilis and analyze the cerebrospinal fluid (CSF) of ocular syphilis patients to determine the co-occurrence of neurosyphilis.

Methods

This was a retrospective study of 17 patients (23 eyes) with ocular syphilis admitted to the Fifth People's Hospital, Suzhou, China from September 2017 to December 2021. Clinical manifestations, laboratory tests, treatment, and clinical outcomes were analyzed, and a review was conducted.

Results

Eight males (12 eyes) and nine females (11 eyes) were enrolled. Mean patient age was 49.06 ± 3.47 years. The total manifestation time for ocular symptoms ranged from 10 days to 6 years. The cohort was comprised of three cases of early syphilis, four cases of late syphilis, and ten cases of unknown stage. The primary complaints were decreased visual acuity in 15 cases (21 eyes), ptosis in 1 case (1 eye), and loss of light perception in 1 case (1 eye). Cases were diagnosed as chorioretinitis in 7 cases (8 eyes), optic nerve retinitis in 4 cases (6 eyes), optic neuritis in 4 cases (7 eyes), and oculomotor nerve palsy in 1 case (1 eye), syphilitic stromal keratitis in 1 case (1 eye). Serum HIV antibody was positive in one case(Nos.2). All patients had reactive serum Treponema Pallidum Particle Agglutination (TPPA) and Toluidine Red Unheated Serum Test (TRUST). All patients underwent CSF examination. CSF white blood cell count was ≥5 × 10⁶/L in 13 cases, CSF protein was >500 mg/L in 6 cases, TPPA was reactive in 15 cases, and TRUST was reactive in 5 cases. Eleven cases were also diagnosed with neurosyphilis. Patients were treated with either penicillin G sodium or ceftriaxone sodium. At time of discharge, 12 patients reported improved visual acuity. Abnormal serum or CSF examination improved in ten patients during the 6–12 month follow-up.

Conclusion

Visual acuity loss is a warning indicator of ocular syphilis. Ocular syphilis primarily manifests as posterior uveitis, involving the choroid, retina, and optic nerve, and often co-occurs with neurosyphilis. Effective treatment should be administered immediately to avoid irreversible visual impairment and other serious adverse outcomes.

Ocular syphilis in an immunocompetent host

Syphilis is an old disease that experienced a resurgence with the emergence of HIV/AIDS. Syphilis is a reportable infection that is monitored by the Centers for disease Control (CDC) in the U.S. and rates have been rising since 2000. Although ocular syphilis is a well known consequence of syphilis infection it continues to be less frequently diagnosed, partially because ocular manifestations are not reportable to CDC. While the majority of recent cases in the U.S. have been reported in men who have sex with men (MSM) population, 50 % of these cases are HIV negative. We present a case of acute iridocyclitis and ocular hypertension due to syphilis infection. This case reiterates the need to increase healthcare workers' awareness of the importance of timely recognition of potential ocular syphilis to prevent visual sequelae from the infection. Ocular syphilis should be kept in the differential diagnosis in immunocompetent/HIV negative patients, and the importance of obtaining a detailed sexual history should not be forgotten.