Executive Editor: Daniel Buchbinder General Editor: Daniel Buchbinder

Authors: S Fusetti, B Hammer, R Kellman, C Matula, EB Strong, Co-author: A Di Ieva

Skull base & Cranial vault

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Glossary

Lateral skull base approach
Lateral skull base approach enlarge

Patient positioning

Place the patient in a supine position on the operating table. Fix the head with a head holder. Turn the head such that the malar eminence it the highest point. It is useful to place a shoulder roll in order to prevent excessive strain on the cervical spine.

In this position the frontal lobes fall away from the floor of the frontal cranial fossa and thereby avoiding unnecessary retraction.


Lateral skull base approach enlarge

Access area

With the lateral skull base approach the lateral anterior and the middle cranial fossae can be reached.


Lateral skull base approach enlarge

Skin incision

A skin incision in the shape of a question mark is made from a skin crease anterior to the tragus to the midline of the skull. If possible, it should not cross the hairline.

Depending on the fracture also alternative skin incisions are possible. The dashed line shows one such alternative incision.


Lateral skull base approach enlarge

Elevation of the scalp

The scalp is elevated in two layers splitting the temporal fat pad. The superficial fat pad, which contains the frontal branches of the facial nerve, is preserved and carefully elevated with the galeal layer.


Lateral skull base approach enlarge

Incision of the temporal fascia and temporal muscle

A T-shaped incision is made cutting the temporal fascia (1) and along the axis (2) of the muscle itself in order to create a posterior musculofascial flap. This can be used for reconstruction.


Lateral skull base approach enlarge

You should save a cuff of a fascia and temporal muscle over the temporal line (1) in order to suture the temporalis muscle at the end of the procedure.


Lateral skull base approach enlarge

Handling of temporal muscle

Elevate the muscle subperiosteally and reflect the temporal flap anteriorly.


Lateral skull base approach enlarge

Craniotomy

Place a burr hole in the typical position for the lateral skull base. Take care that the burr hole is located under the temporalis muscle and as far basal as possible for cosmetic reasons.


Lateral skull base approach enlarge

Perform a curvilinear craniotomy. According to the location of the fracture it is important to extend the bone flap down toward the base of the middle cranial fossa. Sometimes the optimal method is performing two thirds of the craniotomy with a craniotome and one third of the cut along the floor of the middle cranial fossa a high speed air drill. The bone defect at the skull base can be reconstructed using bone substitutes.


Lateral skull base approach enlarge

Elevation of the bone flap by means of elevators

Carefully detach the bone flap from the dura using a dissector, thereby elevating it.


Lateral skull base approach enlarge

Carefully elevate the dura from the lateral skull base (middle cranial fossa). Elevate the temporal lobe as necessary to expose the fracture.


Lateral skull base approach enlarge

Exploration of middle fossa

After gentle retraction, the entire middle fossa can be explored.

v1.0 2011-05-14