<prompt> Voex Vein invasion is commonly seen in:RetinoblastomaMalignant melanomaOptic nerve gliomasMedullo-epitheliomas  <response>: B i.e. Malignant melanoma Malignant melanoma of choroid is the commonest intraocular malignant primary tumor in adults Q. It involves voex veins Q as choroidal tissue is drained by these veins. 