Six month old boy with leukocoria and abnormal findings on fundoscopy.
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MR findings demonstrate right intraocular mass within the posterior inferior aspect of the right globe at the level of the retina, that is T1 mildly hyperintense and T2 hypointense relative to vitreus.
There is post contrast heterogenous enhancement within the mass.
No extraocular extension, optic nerve and meningeal sheath invasion.
Mild subretinal hemorraghe best seen at T2WI.
The left orbit appears normal.
Retinoblastoma is the most common malignant intraocular tumor of childhood.
Diagnosis of retinoblastoma is usually made by fundoscopy and US.
CT best for demonstrating calcifications.
MRI best for extraocular extensions, tumor infiltration of the optic nerve and intracranial disease.