Diffuse Unilateral Subacute Neuroretinitis C0339404
A rare inflammatory eye disease caused by parasites affecting the retina and optic nerve. Early treatment with antiparasitic and anti-inflammatory medications can prevent vision loss. Prompt diagnosis is important for preserving sight.
Key facts at a glance
- ICD-10
- H53.9
- ICD-11
- 9A00.0
- Body system
- ophthalmologic
- Severity
- severe
- Chronic
- false
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Unilateral vision loss
Visual field defect
Optic disc edema
Retinal pallor
Generalized symptoms
(ophthalmologic)Significant symptoms that substantially affect daily functioning.
Frequency: Varies
Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Antiparasitic medication therapy
Oral anthelmintic medications to eliminate the nematode parasite causing the infection. Treatment aims to halt progression and preserve remaining vision in affected eyes.
Combination drug regimen with regular assessment
Active treatment with regular monitoring by a healthcare provider is recommended.
Laser photocoagulation
Direct laser ablation of visible subretinal worms when identifiable. This localized destruction targets the parasite while preserving surrounding retinal tissue.
Additional treatment options
Anti-inflammatory therapy
Corticosteroid therapy to manage the inflammatory response associated with dying parasites and to reduce secondary damage to retinal structures.
medicationVitrectomy with parasite removal
Surgical intervention to remove the vitreous and potentially extract visible worms. Considered when medical therapy fails or parasites are surgically accessible.
surgicalOphthalmologic surveillance
Long-term eye examinations including visual field testing, electroretinography, and imaging to monitor for disease progression, complications, and treatment response.
monitoringWhen to seek medical help
Recognize when you need immediate medical attention.
See a doctor within 24 hours
Moderate to severe symptoms that may indicate worsening of this condition. Prompt medical evaluation is recommended.
Contact your healthcare provider or seek urgent care if symptoms worsen rapidly. Go to the emergency department for life-threatening symptoms.
Frequently asked questions
Common questions about this topic.
What is Diffuse Unilateral Subacute Neuroretinitis C0339404?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalMedication Comparisons
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View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 27, 2026. · Read our editorial policy