craniotrypesis

cra·ni·o·try·pe·sis

(krā'nē-ō-tri-pē'sis),
Trephining of the skull.
[cranio- + G. trypēsis, a boring]

craniotrypesis

(krā″nē-ō-trĭ-pē′sis) [″ + Gr. trypesis, a boring]
The introduction of trephine or burr holes into the cranial bones.