Approach to leukocoria (pediatrics) Quiz: Ace Your Exams

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An 18-month-old boy presents to the clinic for evaluation of a newly noted squint. There is no history of pet exposure, fever, rash, seizures, trauma, or recent illness. The child was born at term, and prenatal history is unremarkable. Past medical and surgical histories are non-contributory. Family history is notable for osteosarcoma in the father. Temperature is 37°C (98.6°F), pulse is 132/min, respirations are 25/min, blood pressure is 90/46 mmHg, and oxygen saturation is 100% on room air. Physical examination is notable for strabismus. No dysmorphic features are seen. Direct ophthalmoscopy reveals a white pupil on the right and a normal red reflex on the left. A whitish-gray retinal mass is seen on fundoscopic exam. Which of the following would confirm this patient’s diagnosis?

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