<prompt> Voex vein invasion is a feature ofMalignant melanomaRetinoblastomaMedulloepitheliomaOptic nerve glioma  <response>: Malignant melanoma of choroid shows extraocular spread along the perivascular spaces of the voex veins or ciliary vessels. Extraocular extension also occurs due to progressive growth of the tumor that may burst through sclera, usually at the limbus Ref. Khurana page no.174 