Retinal neovascularization and ocular toxoplasmosis

Area of Science:

• Ophthalmology
• Infectious diseases
• Retinal vascular diseases

Background:

• Ocular toxoplasmosis can lead to vision-threatening complications.
• Retinal neovascularization is a rare but serious sequela of ocular toxoplasmosis.
• Vitreous hemorrhage can result from retinal neovascularization in toxoplasmosis patients.

Observation:

• Three female patients presented with inactive toxoplasmosis scars.
• Scars were associated with retinal arteriole/venule occlusion, capillary nonperfusion, and adjacent neovascularization.
• Patient ages ranged from 19 to 70 years.

Findings:

• Photocoagulation of ischemic areas successfully halted hemorrhage and resolved neovascularization in two patients.
• In one patient, spontaneous avulsion of the neovascular frond from the supplying arteriole occurred without intervention.
• These findings suggest a link between vascular occlusion in toxoplasmosis scars and subsequent neovascularization.

Implications:

• Photocoagulation is an effective treatment for retinal neovascularization secondary to ocular toxoplasmosis.
• Understanding the pathogenesis of neovascularization in toxoplasmosis can guide therapeutic strategies.
• Early detection and management of these vascular complications may prevent severe vision loss.