Translabyrinthine Craniotomy
Trans- A prefix meaning through, across or beyond (Source: Dorland's Illustrated Medical Dictionary, 27th Edition)
Labyrinthine- Pertaining to the labyrinth - a system of intercommunicating cavities or canals, especially that constitute the internal ear (Source: Dorland's Illustrated Medical Dictionary, 27th Edition)
Craniotomy- Any operation on the cranium; incision into the cranium (Source: Dorland's Illustrated Medical Dictionary, 27th Edition)