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
Most common intracranial tumour encroaching the orbit is 
Select and explain. 
A. Astrocytoma, B. Glioblastoma multiforme, C. Sphenoid wing meningioma, D. Medulloblastoma
C: Sphenoid wing meningioma
Answer: C: Sphenoid wing meningioma 
Explanation: The intracranial meningiomas which secondarily invade the orbit are arising from the sphenoid bone. Orbital invasion may occur through: floor of anterior cranial fossa, superior orbital fissure and optic canal. Ref khurana page no.423