What is Coats Disease

Coats disease is a rare, non-hereditary eye condition characterized by abnormal development of the blood vessels in the retina, which can lead to fluid leakage, vision loss, and retinal detachment.

Coats disease primarily affects the ocular system, specifically the retina—the light-sensitive tissue at the back of the eye. In patients with this condition, the retinal blood vessels develop weak, thin walls, causing them to leak fluid and fatty deposits (exudates) into the retina. Over time, this fluid buildup can lead to swelling, scarring, and, if left untreated, total retinal detachment.

Who is Affected?

Coats disease is considered a rare condition, though exact prevalence remains difficult to determine because mild cases may go undiagnosed. It predominantly affects young males, with symptoms often appearing in the first or second decade of life. While it can occur in females, the male-to-female ratio is significantly skewed, typically estimated at 3:1. There is no known geographic, ethnic, or racial predisposition for the disease.

Key Characteristics and Pathophysiology

The disease is usually unilateral, meaning it affects only one eye, which is a key clinical feature that helps differentiate it from other pediatric retinal conditions like retinoblastoma. The underlying mechanism involves a breakdown of the blood-retina barrier, likely due to mutations in specific genes (such as NDP or CTNNB1) that disrupt vascular development, though it is not classified as an inherited genetic disorder. Physicians generally classify the disease into five stages, ranging from simple telangiectasia (dilated vessels) in Stage 1 to advanced total retinal detachment and secondary complications like glaucoma in Stage 5.

Differentiating Coats Disease

Unlike retinoblastoma, which is a life-threatening cancer, Coats disease is a vascular developmental anomaly. However, because both can present with a "white pupil" (leukocoria) in photographs, it is critical for patients to undergo a thorough dilated eye examination by a pediatric ophthalmologist or retina specialist to rule out malignancy and initiate appropriate management, such as laser photocoagulation or cryotherapy.

Medical Disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Always seek the advice of your ophthalmologist or other qualified health provider with any questions regarding your medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Coats Disease


• Orphanet: Coats Disease


• American Academy of Ophthalmology (AAO): EyeWiki - Coats Disease