This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Ophthalmology
Voex vein invasion is a feature of 
Select and explain. 
A. Malignant melanoma, B. Retinoblastoma, C. Medulloepithelioma, D. Optic nerve glioma
A: Malignant melanoma
Answer: A: Malignant melanoma 
Explanation: 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