Most common intracranial tumour encroaching the orbit is
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
Astrocytoma
Glioblastoma multiforme
Sphenoid wing meningioma
Medulloblastoma
Tumors