Background: Foramen Ovale (FO) is the most important constant foramen of greater wing of sphenoid in the middle cranial fossa. It opens into infratemporal fossa and gives passage to mandibular nerve, accessory meningeal Artery, lesser petrosal nerve, emissary veins. It is usually oval in shape but its shape shows variations when compared to rest of the foramina in the skull. It is of great significance to neurosurgeons as transcranial approach to skull base is possible via it in case of trigeminal neuralgia.