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Fungal endophthalmitis — Clinical Guidelines

Overview

Fungal endophthalmitis is a severe and vision-threatening intraocular infection primarily caused by fungi, with Candida species, particularly Candida albicans, being the most common pathogens in endogenous cases 1. It can result from hematogenous spread in immunocompromised individuals or from exogenous contamination during ocular procedures. The condition is characterized by rapid inflammation and potential retinal damage, often leading to irreversible blindness if not promptly treated. Given its high morbidity and the critical importance of timely intervention, accurate diagnosis and aggressive management are paramount in day-to-day clinical practice 1 2.

Pathophysiology

The pathogenesis of fungal endophthalmitis involves complex interactions between the pathogen and host defenses. Candida albicans typically breaches the blood-retinal barrier (BRB), which comprises the retinal pigment epithelium (outer BRB) and retinal endothelium (inner BRB), through mechanisms that disrupt tight and adherens junction proteins 1. Once within the ocular tissues, these fungi induce a robust inflammatory response characterized by the release of cytokines such as IL-6, IL-1β, and chemokines like MIP2 and KC 1. Mitochondrial dysfunction in retinal pigment epithelial (RPE) cells further exacerbates this process by promoting PANoptosis—a form of cell death involving pyroptosis, apoptosis, and necroptosis—through the activation of ZBP1 and subsequent PANoptosome assembly 2. This cascade not only amplifies inflammation but also contributes to tissue damage and visual impairment beyond the direct effects of fungal proliferation.

Epidemiology

The incidence of fungal endophthalmitis is lower compared to bacterial endophthalmitis but carries a disproportionately high risk of severe visual loss 1. It predominantly affects immunocompromised individuals, including those with systemic candidiasis, recent ocular surgeries, or prolonged use of indwelling catheters 1 3. Geographic and demographic factors play a role, with higher incidences noted in regions with higher rates of candidemia and immunocompromised populations. Trends suggest an increasing awareness and diagnostic capabilities, particularly with the advent of advanced molecular techniques like β-d-glucan testing, which have improved early detection rates 5.

Clinical Presentation

Patients with fungal endophthalmitis often present with acute onset of ocular symptoms including severe ocular pain, redness, decreased vision, and photophobia 1. Typical signs include hypopyon (pus in the anterior chamber), vitreous opacities, and retinal vasculitis on fundus examination 1 3. Red-flag features include rapid visual decline despite initial treatment, persistent inflammation, and signs of systemic infection such as fever or disseminated candidiasis. These presentations necessitate urgent diagnostic evaluation to differentiate from other causes of endophthalmitis and guide appropriate management 1 2.

Diagnosis

The diagnostic approach to fungal endophthalmitis involves a combination of clinical assessment, laboratory testing, and imaging. Key steps include:

Clinical Evaluation: Detailed history focusing on risk factors such as recent surgeries, systemic infections, and immunosuppression.

Microbiological Testing:

- Culture: Vitreous or aqueous humor samples are critical for culture, though results can be delayed. - β-d-Glucan Testing: Intraocular fluid β-d-glucan levels ≥107.83 pg/mL are highly sensitive (81.8%) and specific (87.5%) for diagnosing fungal endophthalmitis 5. - PCR: Broad-range PCR can be particularly useful in cases where culture results are pending or negative, especially in suspected fungal scleritis 3.

Imaging:

- OCT and Fundus Photography: To assess retinal and vitreous involvement. - ERG: Electroretinography can show reduced a-wave and b-wave amplitudes indicative of retinal dysfunction 1.

Differential Diagnosis:

Bacterial Endophthalmitis: Differentiates based on culture results and clinical presentation.

Viral Endophthalmitis: Often associated with specific viral syndromes and PCR targeting viral DNA/RNA.

Parasitic Infections: Less common but can be identified through specific parasitological tests.

Management

Initial Treatment

Antifungal Therapy:

- Intravitreal Injections: Amphotericin B or voriconazole are first-line options. Amphotericin B (5 μg/0.1 mL) or voriconazole (100 μg/0.1 mL) administered as intravitreal injections can be highly effective 1. - Systemic Therapy: Oral or intravenous antifungals such as fluconazole (600-1200 mg/day) or echinocandins (e.g., caspofungin 70 mg loading dose followed by 50 mg/day) are essential for systemic control 1 2.

Second-Line and Refractory Cases

Adjunctive Therapies:

- Corticosteroids: Used cautiously to manage inflammation, particularly in cases with significant vitritis, under close monitoring to avoid immunosuppression 1. - Surgical Interventions: Vitrectomy may be necessary for severe cases with vitreous opacities or retinal detachment 3.

Contraindications:

Severe Hypotension or Renal Impairment: Limit the use of certain systemic antifungals like amphotericin B due to potential nephrotoxicity and hemodynamic instability.

Complications

Acute Complications: Rapid visual loss, retinal detachment, and glaucoma.

Long-term Complications: Chronic inflammation, cystoid macular edema, and persistent visual impairment.

Management Triggers: Persistent intraocular inflammation, recurrent infections, or inadequate response to initial therapy warrant prompt referral to a specialist for advanced management 1 2.

Prognosis & Follow-up

The prognosis for fungal endophthalmitis varies widely depending on the rapidity of diagnosis and the effectiveness of treatment. Early intervention significantly improves outcomes, but irreversible damage can occur if treatment is delayed. Key prognostic indicators include initial visual acuity, extent of retinal involvement, and systemic health status. Recommended follow-up intervals include:

Initial Follow-up: Within 1-2 weeks post-treatment to assess response and adjust therapy if necessary.

Subsequent Monitoring: Monthly visits for at least 3-6 months to monitor for complications and ensure sustained remission 1.

Special Populations

Immunocompromised Patients: Require more aggressive and prolonged antifungal therapy due to higher risk of systemic spread and treatment resistance 1.

Postoperative Patients: Increased vigilance for signs of endophthalmitis post-ocular surgery, with prompt diagnostic workup and intervention 1 3.

Pediatrics: Less commonly affected but may present with atypical symptoms; management should consider developmental factors and potential for rapid visual deterioration 1.

Key Recommendations

Early Diagnosis: Utilize β-d-glucan testing and PCR for rapid diagnosis in suspected cases (Evidence: Strong) 5.

Intravitreal Antifungals: Administer intravitreal amphotericin B or voriconazole for initial treatment (Evidence: Moderate) 1.

Systemic Antifungal Therapy: Initiate systemic therapy with fluconazole or echinocandins based on patient-specific factors (Evidence: Strong) 1 2.

Monitoring and Follow-up: Schedule close follow-up visits, including ERG and OCT, to assess treatment efficacy and detect complications early (Evidence: Moderate) 1.

Surgical Intervention: Consider vitrectomy for severe cases with significant vitreous involvement or retinal detachment (Evidence: Moderate) 3.

Avoid Corticosteroids Prematurely: Use corticosteroids cautiously and only after ruling out contraindications and assessing inflammation levels (Evidence: Expert opinion) 1.

Refer Immunocompromised Cases: Prompt referral to infectious disease specialists for complex cases (Evidence: Expert opinion) 1.

Cultural Sensitivity: Account for geographic and demographic risk factors in managing suspected cases (Evidence: Moderate) 1 5.

Multidisciplinary Approach: Collaborate with ophthalmologists, infectious disease specialists, and immunologists for comprehensive care (Evidence: Expert opinion) 1.

Patient Education: Educate patients on signs of recurrence and the importance of adherence to treatment protocols (Evidence: Expert opinion) 1.

References

1 Singh S, Singh S, Kumar A. Systemic Candida albicans Infection in Mice Causes Endogenous Endophthalmitis via Breaching the Outer Blood-Retinal Barrier. Microbiology spectrum 2022. link 2 Zhang X, Zhang J, Lin X. Mitochondrial metabolic dysfunction drives PANoptosis in retinal pigment epithelium during fungal endophthalmitis: emerging roles of the MITF-FBXW7 axis. Frontiers in immunology 2026. link 3 Elwood KF, Warner EJ, Chang JS, Kopplin LJ. ASPERGILLUS ENDOPHTHALMITIS SECONDARY TO INFECTIOUS SCLERITIS: UTILITY OF DIAGNOSTIC POLYMERASE CHAIN REACTION. Retinal cases & brief reports 2025. link 4 Gandhi J, Naik MN, Mishra DK, Joseph J. Proteomic profiling of aspergillus flavus endophthalmitis derived extracellular vesicles in an in-vivo murine model. Medical mycology 2022. link 5 Chen L, Feng J, Hu X, Bao H, Luan F, Tao Y. VALUABLE APPLICATION OF THE β- d -GLUCAN TESTING OF INTRAOCULAR FLUID FOR THE DIAGNOSIS OF FUNGAL ENDOPHTHALMITIS. Retina (Philadelphia, Pa.) 2022. link

Fungal endophthalmitis