H35.33 Angioid streaks of macula

Name of the Condition

• Angioid Streaks of Macula

Summary

Angioid streaks of the macula are irregular, branching lines that develop beneath the retina, typically in the macular region. These streaks represent breaks in Bruch's membrane, a layer supporting the retinal pigment epithelium and photoreceptors. They may be associated with vision changes, though progression varies. The condition is often linked to underlying systemic diseases or genetic factors.

Causes

The exact cause of angioid streaks is not fully understood, but they result from calcification and fragmentation of Bruch's membrane. This can occur due to genetic disorders (e.g., pseudoxanthoma elasticum), inflammatory conditions, or systemic diseases affecting elastic tissue. Trauma or excessive sun exposure may also contribute in some cases.

Risk Factors

• Genetic predisposition (e.g., pseudoxanthoma elasticum).
• Systemic conditions like sickle cell disease or Paget's disease.
• History of trauma to the eye.
• Prolonged exposure to ultraviolet light.

Symptoms

• Blurred or distorted central vision.
• Metamorphopsia (distorted perception of straight lines).
• Scotomas (blind spots) in the central visual field.
• Reduced visual acuity, especially in advanced cases.

Diagnosis

Diagnosis involves a comprehensive eye examination, including funduscopy to visualize the streaks. Optical coherence tomography (OCT) assesses retinal layers and potential complications. Fluorescein angiography may be used to evaluate choroidal neovascularization. Underlying systemic conditions are investigated through clinical history and testing.

Treatment Options

Treatment focuses on managing complications, such as choroidal neovascularization, with anti-VEGF injections. Laser photocoagulation or photodynamic therapy may be considered in select cases. Addressing underlying systemic diseases (e.g., controlling blood pressure in pseudoxanthoma elasticum) is also important.

Prognosis and Follow-Up

Prognosis depends on the presence and severity of complications like choroidal neovascularization. Regular eye examinations are recommended to monitor for progression. Early detection of complications can help preserve vision, though some degree of vision loss may be irreversible.

Complications

• Choroidal neovascularization (abnormal blood vessel growth).
• Hemorrhage or fluid leakage under the retina.
• Geographic atrophy (thinning of retinal tissue).
• Permanent central vision loss in severe cases.

Lifestyle & Prevention

• Protect eyes from excessive sunlight with UV-blocking sunglasses.
• Manage underlying systemic conditions (e.g., blood pressure, cholesterol).
• Avoid eye trauma and seek prompt care for ocular injuries.
• Maintain a balanced diet rich in antioxidants to support retinal health.

When to Seek Professional Help

Seek immediate medical attention if you experience sudden vision changes, such as blurring, distortion, or blind spots. Regular eye exams are advised for those with risk factors or a history of related conditions.

Tips for Medical Coders

Document the presence of angioid streaks and any associated complications (e.g., choroidal neovascularization) clearly. Ensure the diagnosis is supported by clinical findings and imaging. Note the laterality (e.g., unilateral or bilateral) if specified. Follow guidelines for coding underlying systemic conditions when applicable.