This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proptosis, Enophthalmos, Developmental Anomalies, Subject name: Ophthalmology
Intermittent proptosis is seen in? 
Select and explain. 
A. Orbital tumor, B. Orbital cellulitis, C. Orbital varices, D. Cavernous sinus thrombosis
C: Orbital varices
Answer: C: Orbital varices 
Explanation: ANSWER: (C) Orbital varicesREF: Khurana 4th ed p. 381Causes of intermittent proptosis:Orbital varicesPeriodic orbital edemaRecurrent orbital hemmorrhageHighly vascular tumor