”The “lockhole” is the eye of the door, and it is well known that large objects can be seen through a small “lockhole. In neurosurgery, this means that larger lesions in deeper locations can be revealed through a small, appropriately positioned craniotomy. By choosing the correct approach to the foramen ovale, the extent of the craniotomy will be greatly reduced, thus reducing unnecessary exposure and strain on the brain tissue. These advantages of the minimally invasive foraminal procedure will help to improve surgical outcomes, including reduced complications such as bleeding, cerebrospinal fluid leakage, infection and scarring, resulting in shorter hospital stays and reduced hospital costs. This surgical technique is applicable to most neurosurgical procedures, especially when the lesion is deep. Minimally invasive and functional neurosurgery emphasizes on reaching the lesion as minimally invasively as possible by individualizing the craniotomy, narrowing the scope of the craniotomy, choosing a precise path, and performing the surgical operation with minimal trauma to achieve the best outcome and return the patient to normal life and work as soon as possible.