Bilateral Retinoblastoma with Lumbar Spine and Forearm Metastasis, Six Years after the Initial Presentation: A Rare Case Report

Retinoblastoma is one of the most common childhood intraocular tumours. Extra-ocular extension is rare, but the risk of systemic metastasis increases with late diagnosis. We report a case of retinoblastoma metastasis to the forearm six years after the first diagnosis was made and treated. It is believed to add to our understanding of retinoblastoma metastasis, and this relatively uncommon disease course.