Skip to main content
. 2009 Jan;19(1):48–56. doi: 10.1055/s-0028-1103127

Figure 2.

Figure 2

The surgical field from the skin to the dura. The skin flap (SF) is raised anteriorly, and the musculoaponeurotic flap (MF) is turned caudally. The bone removal includes a retrosigmoid craniotomy and a posterolateral petrosectomy up to the posterior semicircular canal, the antrum, fallopian canal (FC), and the posterior wall of the outer ear canal. The sigmoid sinus (SS) runs across the field, and the dotted line shows the dura incision. The jugular vein (JV) is ligated in the upper neck. PSC, posterior semicircular canal. (Reprinted from Mazzoni A, Sanna M. A posterolateral approach to the skull base: the petro-occipital transsigmoid approach. Skull Base Surg 1995;5:157–167.)