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Ophthalmology – Bartonella Neuroretinitis
Bartonella neuroretinitis is a form of neuroretinitis characterized by optic disc swelling accompanied by a distinctive pattern of hard exudates radiating from the macula in a “macular star” configuration. The most common infectious cause is Bartonella henselae, a gram-negative bacillus associated with cat-scratch disease. While neuroretinitis can result from various infectious and inflammatory conditions, Bartonella infection remains the leading identifiable etiology.
This condition can affect individuals of all ages but is most commonly seen in patients in their third to fourth decades of life. There is no clear gender predilection. A key risk factor is exposure to cats, particularly kittens, as transmission typically occurs through scratches or bites. Other infectious causes of neuroretinitis include syphilis, viral infections, toxoplasmosis, toxocariasis, histoplasmosis, and Lyme disease. Noninfectious causes such as sarcoidosis may also present similarly and should be considered in the differential diagnosis.
Patients typically present with visual complaints such as blurred vision and eye discomfort, often worsened by eye movement. Systemic symptoms may accompany the ocular findings, especially in cases related to cat-scratch disease, and can include fever, malaise, headache, and muscle aches. A detailed history is important, including animal exposure, travel, dietary habits, and sexual history, to help identify potential infectious etiologies.
On examination, visual acuity can range widely from normal to severely reduced, even to light perception in some cases. Common findings include decreased color vision, a relative afferent pupillary defect, and optic disc edema. The hallmark feature is the presence of macular hard exudates arranged in a star pattern around the fovea. Additional findings may include splinter hemorrhages, retinal vascular occlusions, small yellow-white retinal or choroidal infiltrates, and vitreous inflammation. In systemic Bartonella infection, patients may also exhibit lymphadenopathy, arthritis, or neurologic involvement such as meningitis or encephalitis.
Diagnosis is primarily clinical but supported by laboratory and imaging studies. Serologic testing for Bartonella henselae is commonly used, with ELISA being widely available. Testing for other infectious causes should be performed as indicated. Fluorescein angiography typically demonstrates optic disc leakage and staining of peripapillary vessels. Visual field testing often reveals a cecocentral scotoma, which is the most common defect associated with this condition.
The differential diagnosis includes optic neuritis and other forms of optic neuropathy, which may present with similar visual symptoms but lack the characteristic macular star. Identifying the underlying cause is crucial for appropriate management.
Treatment of Bartonella neuroretinitis generally involves antibiotic therapy. First-line treatment for cat-scratch disease includes oral ciprofloxacin, although other antibiotics such as azithromycin, doxycycline, erythromycin, or rifampin may also be used depending on clinical circumstances. Patients should be co-managed with a primary care physician or infectious disease specialist, in addition to close ophthalmologic follow-up.
The prognosis is typically favorable, as Bartonella neuroretinitis is often self-limited. Optic disc swelling usually resolves within 6 to 8 weeks, while macular exudates may take 6 to 12 months to fully resolve. Some patients may experience persistent visual symptoms such as mild blurring or metamorphopsia, and residual optic disc pallor can occur. Recurrence is uncommon. Potential complications include permanent visual loss and systemic complications related to the underlying infectious or inflammatory condition.
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