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(A) Potential PNS routes along maxillary nerve (V2), commonly aiming pterygopalatine fossa (PPF). (B) From PPF, the tumor (tu.) can spread either in more common retrograde (blue arrows) or in anterograde (red arrows) fashion [7,10,11,35]. n: Nerve; ggl: Ganglion; GSPN: Great superficial petrosal nerve.
