Generalized Extension of Referred Trigeminal Pain due to Greater Occipital Nerve Entrapment

Figure 3

Intraoperative images showing the entrapment of the greater occipital nerve (GON) during the decompression. (a) Intraoperative images showing severe entrapment of the right GON (black arrows) by the fibrous, aponeurotic edge of the trapezius muscle (white arrows) along the superior nuchal line. The inset shows the direction of the image and the location of the incision. (b) Intraoperative image after decompression of the right GON (black arrows) with division of the trapezial aponeurosis (white arrows). The most severe part of the GON constriction is indicated by a white arrowhead. (c) Intraoperative image showing an entrapment of the left GON (black arrows) with elevation of the aponeurotic edge of the trapezius muscle (white arrows). The inset shows the direction of the image and the location of the incision. (d) Intraoperative image after decompression of the left GON (white arrows) with division of the trapezial aponeurosis (white arrows). The maximal compression area (white arrowhead) of the left GON shows reddish discoloration and constriction.

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