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. 2021 Jun 29;22(1):22–38. doi: 10.17305/bjbms.2021.5897

FIGURE 2.

FIGURE 2

Potential PNS routes along ophthalmic nerve (V1), starting from primary tumor in a retrograde manner (blue arrows). Pathways 3 and 4 are less commonly involved [7,10,11,35]. n: Nerve; ggl: Ganglion.