293568.fig.004a
(a)
293568.fig.004b
(b)
293568.fig.004c
(c)
Figure 4: Surgical procedure. (a) Patient prepared for surgical decompression of the internal jugular vein; course of the vein and omohyoid muscle are marked in black, please note the widened external jugular vein (white arrow), (b) atypical omohyoid muscle compressing the internal jugular vein: (c) fully widened internal jugular vein after surgical transection of the muscle.