Late presentation of Coats disease in a 12-year-old boy: a case report.

Coats disease is a rare abnormality characterized with retinal telangiectasia and aneurysms with retinal exudation, most often seen in young males and usually affecting only one eye. A 12-year-old boy came in with a three-month history of vision loss and pain in his right eye, alongside progressively worsening blurred vision over the last year. His visual acuity was reduced to only light perception in the right eye, while his left eye maintained 5/5 vision. The intraocular pressure was 43.4 mmHg in the right eye and 15 mmHg in the left eye. Conjunctival hyperaemia, mild corneal edema, iris neovascularization, xantocoria, and dilated pupil was found in anterior segment. Ophthalmoscopy showed retinal telangiectasia in all quadrants and total bullous exudative retinal detachment. Coats disease cases that present at an advanced stage have fewer treatment options and generally a worse prognosis.