"The exact boundaries will, however, vary somewhat between authors and depending on speciality with some definitions dividing the central base of skull into midline, parasagittal and lateral compartments 4."
"As these boundaries are not respected by pathology it is of academic interest only and in clinical practice, a more pragmatic definition can be safely used in most instances; the central base of skull is that portion of the skull base centred on the pituitary fossa and encompassing the cranial nerve foramina for cranial nerves II to VI and the upper clivus."