ABSTRACT.Purpose: To describe a patient with sickle cell trait who developed latent proliferative sickle cell retinopathy after mild blunt trauma. P roliferative sickle cell retinopathy is characterized by vascular proliferation and is most commonly observed in patients with Hb SC, Hb S-thalassemia and Hb SS. We report a case of a patient with sickle cell trait (Hb AS) who developed latent, uniocular, proliferative sickle cell retinopathy after an episode of mild blunt ocular trauma.
Case ReportA 20-year-old Ghanaian student presented complaining of flashing lights and floaters in his left eye associated with a periorbital aching pain. He was elbowed in the left eye playing football two days earlier, resulting in 'tunnel vision' which settled within one hour. He had no past medical history of note.He had sustained a similar injury to the left eye, playing football three years previously. An ophthalmic assessment then revealed moderate anterior chamber inflammation, intraocular pressure (IOP) 30 mmHg and normal dilated fundoscopy. He was discharged from follow-up after the IOP returned to normal.Current examination showed unaided visual acuity 6 / 5 RE 6 / 6 LE. Pupillary reactions, anterior segments and intraocular pressures were normal. There was no aniscoria. Dilated fundal examination showed no vitreous abnormalities and a normal right fundus. The left fundus showed five areas (150 ae) of peripheral sea-fan neovascularization (Stage 3) with an ischaemic ridge from 9-4 o'clock delineating avascular from vascular retina. He was normotensive and systemic examination was unremarkable.Full blood count, chest X-ray, urea & electrolytes and blood glucose were normal. Haemoglobin electrophoresis revealed the genotype Hb AS (HbA 60%, HbS 40%) with normal mean cell haemoglobin/mean cell volume.Fundus fluorescein angiography delineated the areas of neovascularization and also showed areas of capillary drop out in the peripheral fundus of the left eye (Fig. 1). There was no abnormality in the vasculature in the right eye.