Unilateral Xanthocoria and Retinal Vascular Anomalies in a 3-Year-Old Boy: Retinoblastoma or Coats Disease?

The authors describe a challenging case of unilateral retinoblastoma in a patient referred for xanthocoria. A 3-year-old boy was referred for unilateral xanthocoria and disordered retinal vasculature, suggestive of Coats disease. Further investigation revealed diffuse subretinal tumor seeding and areas of calcification, consistent with retinoblastoma. Enucleation was performed and histopathology confirmed exophytic retinoblastoma. This case highlights that xanthocoria, although often encountered in patients with Coats disease, can sometimes be associated with retinoblastoma. As such, retinoblastoma should be considered in the differential diagnosis for children with both leukocoria and xanthocoria. [.