the removal of a portion of skull in order to access the brain in the performance of an operation, the bone of the skull is not replaced.
Surgical opening of the skull necessary for brain surgery. The bone is not replaced after surgery.
excision of a part of the skull.
Opening of skull and removal of a portion of it.
Excision of a portion of the skull
Surgical operation on the brain in which a portion of the skull is drilled away leaving an opening in the skull. This opening may be left or may be covered by synthetic material ("cranioplasty")
Surgery performed on the skull where pieces of bone are removed to gain access to the brain. and the bone pieces are not replaced.