A 4-year-old girl presented with leukocoria, vision loss, and painless left eye redness. Posterior segment examination revealed a total retinal detachment and abnormal, tortuous retinal vessels in the left eye. No visible mass, vitreous seeding, or hemorrhage were observed. B-mode ultrasound showed a detached retina in a "cinnamon-roll" configuration. Due to poor visual prognosis and high clinical suspicion of malignancy, enucleation was performed. Further histopathological analysis confirmed the diagnosis of diffuse infiltrative retinoblastoma, with an atypical presentation.
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