This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
A 20 year old patient presented with unilateral proptosis which was compressible and increases on bending forward. No thrill or bruit was present. MRI shows a retro-orbital mass with enhancement Diagnosis is 
Select and explain. 
A. AV malformations, B. Orbital encephalocele, C. Orbital Varix, D. Neurofibromatosis
C: Orbital Varix
Answer: C: Orbital Varix 
Explanation: None